Weren't you worried about another 2pr here Boldie. The 2 comes down and he moves in, it looks like he is protecting a made hand 9-8/6-8 etc. I can see why he did what he did, he has an inside str8 draw and probably figures you for a pair with a draw (or maybe just a draw). He thinks that if he leads you move in on him and he can't call but if he moves in, he knocks out loadsa hands that are ahead of him and he probably gives himself 6+ outs to win if he is called.
the only other 2 pair that beats you here is 8's and 9's, so not too worried about that one..if he happens to have that then that's fair enough.
The reason I don't like his push is because it's completely unnecessary and his oppo will know that to. 2800 left at these blind levels is more than enough.
Protecting a made hand, he could do with a 1k bet. I would probably be more worried about a 1k bet then about someone shoving all his chips in the middle. Shoving all your chips in the middle on this board into this pot is not something I would do when holding 2 pair+. Not if I were leading out anyways.
yes he has an inside straight draw..but to risk your entire tourney against someone who reraised you and then called your re-reraise on the flop (which was a fairly weak one BTW...so he tried to show strenght there as Enzyme was always likely to call that one) with essentially nothing but an inside straight draw is silly and I reckon there's no excuse for it really.
If he had continued with a 800-1k raise it would have shown more strenght after his min raise and small re-reraise on the flop and it would have put me off a call more.
If he had shoved with the made straight then he would have been paid off by me, but most people wouldn't do that as they would be milking it.
Of course people with 1 pair would probably fold to his shove..but then again..they would probably fold to a 1K bet aswell.
I know the above is not really a coherent post..but I've got the mother of all man-colds so can't really be too bothered posting a very long and thought out post.
I probably will later on though....as I can't leave a HU post alone

Edit*
And there we go...still with the cold but here's a thought.
What if he had checked the turn?
Enzyme would probably have stuck in a raise...say 500? then he jams..continuing to show strenght and now compared to the pot it's fairly justifiable after all..any serious raise would leave you commited.. I bet ya Enzyme would be more inclined to fold then. afterall he would still have around 2k left at these blind levels and you've shown a reasonable amount of strenght both on the flop (with min raises and re-re raises) and the turn with your check raise.
I would have liked that play...Just don't like the jam here.