The area around Bird Tower was under the effect of Zhu Feiyun's Prop. As a result, the body bag did not fall to the ground when thrown, but flew upwards toward the sky.
But the speed wasn't fast.
Players who arrived near Bird Tower were the same. Without special attention from Zhu Feiyun, the confusion of gravity wasn't intense enough to completely invert: meaning, if he didn't target them, players entering the area were unlikely to tumble head-over-heels into the air like Xu Huo did outside the W19 Experimental Building. Even in weightlessness, gravity in the sky wasn't that strong.
So, when the body bag soared up, the five nearby Players naturally followed the pull of gravity and rose into the air to chase after it.
Although the players outside didn't believe that Xu Huo would throw out Gao Zhen's body so quickly, they still sweated nervously until the body bag opened to reveal an Alien corpse.