Coaster Fu

Trevor McTavish can hit anybody in the pub with a coaster.
With one flick of his wrist, you’re tagged.
The drunker he is, the sharper the coaster’s edge.
Are you in hiding in the toilet? Think he can’t hook it through the door and around the wall?
Go ahead. Say something nasty about his mother. I dare you.
Some say he learned this skill from a monastery of coaster-tossing acolytes. Others say military scientists gave him telekenetic powers.
Only Trevor McTavish and I know the truth, and I’m not telling.
No. Really. I don’t want to lose my other eye.