Ah,
3-betting for information...
What was your plan if you were capped? Fold on the spot when the pot is now huge? Fold the turn when you have odds to chase trips/2 pair? Hero is very likely behind here, and he doesn't need a cap to tell him that much.
Additionally, it takes a special kind of lag to raise JT and A7 preflop. It also takes a special kind of lag to go for a check/raise after raising preflop. It is even more special that he'd check/raise a flush draw in a manner that will blast out the field. With no such read supplied, I think we're looking at AA-JJ, maybe AJ.