Well that's a new level of horrifying, and that's saying a lot considering it's Beacon and everything is pretty horrific.

He instinctively tries to pry it off using his hands, gripping those jaws and trying to break its grip on him. Unfortunately for Kuai he's not immune to his own ice so freezing his leg and the centipede along with it, will just leave him with a frozen leg until he breaks out of it. There's a knife on his belt and he grabs at it, taking a second to figure out the best way to go about this without stabbing himself in the thigh.

Carefully he works the knife between it's jaws trying to pry those teeth out of his skin and he's willing to slice it's head off to do so if he needs to.