I'm surprised no one has yet favoured my rather unsophisticated approach here (re-raise all in). He's going to fold to an all in reraise unless he has one of a small group of hands, only one of which has you completely dominated. The range of hands that he might make this move with is very large from pocker pairs to suited connectors to face cards. Assuming you call and see a flop, any flop that will persude him to act first and show strength is likely to be dangerous. I would justput him to a decision for his tournament and if he wants to make a stand with a medium pair, well, you'll live. If you walk into bullets, you were likely to lose your chips on almost any flop.