Seems to me the SB is protecting his hand on the turn and the river..Why would he make such a large bet if he wants to be paid off..

Either hes probably got the same hand as you, or he was holding AQ (less likely) and slowplayed it. Possible that he was holding a ten and trying to slowplay you and got scared when the king came for the straight possibilities.

I say move all in. In a tournament you really cant pass these opportunities up, you need to accumulate chips. Hes just going to have to show me J10/K10/AQ.