blinds were 15/30 so this was early in a freeroll tournament? Good call, bad community.

If you had been close to the money, or if you had been heavily invested in this tournament, you might want to be more timid. Or if this was a very tight player, and you knew he had something big, you may want to fold. But in this case, he was the chip leader, so he had obviously been playing a lot of hands, and he's probably pretty loose, so you can't put him on AA, KK or AKs with any certainty. Think of how few hands beat your QQ. In your situation, I'd call it all the time.