I know a magician doesn't reveal his secrets I'm not a magician If it wasn't "magic", how...

Professor Petrovsky: [sitting across from each other in a bar] I know a magician doesn't reveal his secrets Mike McDermott: I'm not a magician Professor Petrovsky: If it wasn't "magic", how did you know what everyone held? Mike McDermott: It's a combination of things: I was watching when the cards came out, that's just an old habit with me, it's like breathing Professor Petrovsky: Watch the cards? Mike McDermott: I watch the cards but I also watch the player react to the cards. That's how I knew the DA made his two pair and judge Kaplan missed the flush, I was watching their eyes when they checked their river cards, their faces tell you everything Professor Petrovsky: [Confused] you watch the man? I never knew you had to calculate so much in cards Mike McDermott: here's some advice, just play premium hands, you only start with jacks or better if its good enough to call you've also got to be in there raising, tight but aggressive and I do mean aggressive, you've got to think of it as a war Professor Petrovsky: [Jokingly] you're officially never invited to our game again Mike McDermott: I don't blame you, put a guy like me in that game, cards don't even matter I'll play it blind