i think u gotta call with jacks there, if your just trying to move up the money ladder then its a fold otherwise its a pretty standard call i thnk, especially given the fact the blinds were 400 800. Moreover, you say that its likely a race situation, which it could be, but imo you could also be way ahead. Given you have no information about this player, i think its safe to say that an avg player in that spot could jam 77-1010, A8-AJ, or even less than these hands.