The creature could be anything. William didn't want to take the risk and just stay out in the open.
There was a chance it was something weak—something he and Rena could handle—but it could just as easily be something far too powerful. It didn't make sense to take that chance.
The two of them started climbing the floors of the building they were in. Since the creature was coming from outside, it would have to climb too. That meant staying on the top floor would give them an advantage.
Rena was clearly scared. The screams continued again and again, growing louder each time, as if the creature was getting closer.
The winged snake William had tamed followed them easily, keeping up with their pace without any trouble.
"What do you think that is?" Rena asked.
"I've got no idea," William replied, "but I have a plan."
He didn't stop for even a second to hide. William kept going, carrying Rena as they ascended all the way to the rooftop.
