people bluff I guess 80% more in online poker then they do in real life poker, aspecially in freerolls
or low buyin tourments.
It is a kind of feeling you have to get from his prior actions at your table. If it happens in the first hands it would be gambling for you to know. I guess you can play whenever the odds
that he has those cards are extremly small. You can also remember how he played his hand on the flop (raise, call?) and turn. If someting seems off. Then he is slowplaying or bluffing.