...because he would no longer be "stealing" since the button reraised him. The original raise may very well have been a steal attempt (though I doubt it), but once he reraises the reraiser, he's either got a SERIOUS hand, he's semi-bluffing a raise-worthy hand, or he totally thinks OUR HERO was either stealing/bluffing and he thinks he's got the best of it.

How you determine which of those it might be is dependent on many factors that you haven't listed answers for. Most of them have to do with what our hero has observed throughout play. But absent any other indicators, I'd look at what that $30 means to his stack. If he's got $3000 in front of him, the bet could be meaningless. But if it's half his stack, our hero is definitely in trouble. Realistically our hero may very well be in trouble anyway, considering he's an underdog to any pair, and a huge underdog against AA or KK.

Now, should our hero PLAY the hand? Well, that depends on our hero. What does that $30 do to HIS stack? Can he handle the potential bad beat he's in line for if it happens? And, as previously mentioned, what does he know about his opponent?

But yeah, on the face of it, I think our hero is likely in trouble. Barring more information, I think he's up against AA or KK (or a real idiot/maniac/masochist).