Basic Stud 8 Question.

In general, when you raise with a big split pair on 3rd street in Stud 8 and get reraised by a player whom you have no read on with an ace up, is this always an immediate fold? I can't really think of why you should call, but folding every single time seems horribly weak, and something that could easily be exploited by aggressive opponents.

I guess you could probably make an adjustment if someone was doing this consistently, but what adjustment do you think could be made? Reraise on 3rd, or just call the other guy down if he catches high cards?