Not knowing who this Frappe person is, I would kick myself in the head for slow-playing on 3rd and not finding out where I really am in the hand. Whoever's in the pot with you will give some representation of their hand, in this case it appears Frappe would've reraised you on 3rd. And there you have it, you know he's on split K's. 4th brings him trips and it's an easy fold now. Hope this answers your query.