Because of the anger that she feel towards Rin, the mad enhancement that came from the Berserker Class Card that Beatrice used became more powerful. The mad enhancement of Magni the son of Thor is doubling Beatrice power, healing her wound, and making her losing her mind. And the aura that came out of her body making Arturia and Rin felt a chilt in their body.
Beatrice who are losing her mind is start attacking Arturia as the closest person that she can attack. Her attack maybe strong, but is too easy to read so Arturia can avoid her attack easily. But right after Arturia avoiding her giant punch, suddenly Beatrice left foot kicking Arturia back. And making Arturia body flying about five meters. (I added a bit of healing factor in this act so Beatrice will be a bit stronger that her original manga counterpart)
And Beatrice attack are not stopping just only with a kick, right about when Arturia is about to standing. Beatrice already appear before Arturia and she ready to punch Arturia faces with her giant right hand.
But what Beatrice hit was just a after image of Arturia who have a speed that was much more superior that Beatrice, because of her knight trait and excalibur rapidly. So she easily can avoid Beatrice attack. And Arturia with her superior speed already appear behind Beatrice and slash her with Excalibur rapidly.
But because Beatrice dangerous instinct is rising because of Mad Enhancement. She still have a time to defend her body by using her giant right hand to stop Arturia attack. Arturia didn't look surprised of course when the mad Beatrice is stopping her attack, because she already have a experience fighting someone like Beatrice before.
And Arturia is thinking, that this is the time for her to fight much more seriously. Because even for Arturia who are strong enough to beat a Mao class enemies fighting for a very long time is not something she fond of.
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A thunder is appear around Beatrice body, and once again the fake Mjolnir appear in her right hand. she swung that fake Mjolnir to Arturia. The Excalibur rapidly was destroy in half because Arturia trying to defend herself from Mjolnir attack using the Excalibur Rapidly. The Excalibur rapidly was gone and replaced by Excalibur Transparency and in an instant Arturia body was disappear from Beatrice vision.
Arturia then appear once again in the roof of the building that not far from the fight location. In that roof Arturia taking a breath and then taking out her one of her most beloved sword, the true Excalibur. That she knew are strong enough to beat Beatrice.
But she need a time to charge it power so right now, the one who was fighting Beatrice was Rin. Who a bit overwhelmed by Beatrice who have power and fighting prowess is above Rin.
Thankfully because of Rin trait as Shirou Queen, Rin fighting style is more versatile that Beatrice or Arturia.
She can move as fast as a standard knight, as strong as standard rook, and a magical capabilities of bishop. So she can fighting as a great jack of all trades.
But to fight Beatrice her Queen trait isn't enough and Rin only had one gems that have a big destructive power and she already using it to hurt Beatrice. Right before she was in the mad enhancement mode. So right now, she can only using the spare gems that she had who have low destructive power. To fight againts Beatrice. And she didn't have to worry that she will run out of the gems with low destructive power. Because Shirou making a lot of that gems for her, a hundred thousand of them that she keep inside her pocket dimension. (The gems that Shirou made for her was a copy of a gems that Rin imbued with her magic)
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Rin throw a lot of her low destructive gems to Beatrice. And Rin attack making Beatrice feel a bit overwhelmed and she cannot getting close to Rin at all because of gems. Beatrice durability who are doubling than before is strong enough to withstand Rin attack. So she didn't have a wound or anything because of Rin attack.
But all of the gems that Rin throw at her was strong enough to slow her movement, so right now Rin was doing her job good enough to buying Arturia a time charge her magical power for Excalibur attack. Like they already planned by communicating using telepathy.
"Rin, I already charging enough magical energy to beat that Berserker," Arturia shouted while holding the Excalibur with both of her hand. "Please move aside, or you also will be hurt by my attack."
"You don't have to tell me, that Arturia," Rin said while shooting out a thousand of gems to Beatrice before she teleported to another place. "Because there is no way I can withstand your attack."
Right after Rin teleported using magic circles. A pillar of light was appear from the Excalibur that Arturia withheld. The pillar of light is so tall to the point it can be seen from a far.
"Excalibur!"
Arturia swing her excalibur who was imbued with a lot of magical energy that became a pillar of light to Beatrice. And that pillad of light hit Beatrice body who try to defend herself using the fake Mjolnir and her giant right arm.
But all of that was useless, because only Gilgamesh a Heroic Spirit who was strong enough to withstand the full power of Excalibur. Not even Agni or even Heracles have the ability to withstand the full power of Excalibur.
After Beatrice doll body is destroyed, the Berserker Class Card also destroyed. And then the soul of Beatrice was sealed inside the special Class Card by Rin.
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"Fyuuh that was really are an intense fight," Rin said while she release her Queen form and back to her normal form. "That crazy girl really are a formidable enemies, it really hard to win againts her if I fighting her alone. Thankfully Arturia is helping me or I will be doomed."
"Hey, Rin are you done in sealing her soul?" Asked Arturia who also release her king of knight form and standing beside Rin. "Just like Shirou has planned?"
"Yup, her soul is succesfully sealed inside the Card that Shirou-kun give to me," Answered Rin while showing the card to Arturia. "And with this our job is done and we can let Shirou-kun to take care the last boss."
"Sigh why did Shirou didn't let me going all out from the start!" Protested Arturia while pouting. "If I going all out from the start not even that girl have a chance to win!"
"Arturia if you going all out from the start, I will not have a chances to sealed her soul," Rin said. "And Shirou order to us will be failed."
"Sigh, sometimes I really hate to fighting by a plan," Arturia sighed. "But well, the most important thing is that we already fulfilled our mission from Shirou. Even though I'm a bit confused why did Shirou want to sealed the soul of that girl name Beatrice."
"Who knows?" Rin said with a deep sigh. "Even though I was his girlfriend and also the closest girl that know a lot of thing about him. I didn't know how his mind is working."
"Our lovely Shirou is always making us having a hard time, by his action that sometime really weird and no made sense," Arturia said with a smile. "But he always made the person he loved as the priority, and that's why we loved him so much."
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