Looked at the demo for kicks.

Saw him move, was completely obvious he is a speed hacker.

But for arguments sake lets assume that I may be wrong.

1. Stein checks for player info (can be seen when he mistypes "playertinfo" in chat
2. Stein explains that Bunny is a level 0 undead.
3. Bunny responds by saying "I'm a level 100 pred", which is weird considering he is at an exact number and is shooting a rifle when flame pred is a knife only race (unless there is a different predator).