My Brain Hurts

So Chris E minraised from the hijack. Chad called on the button, Patrick called in the small blind, and Jason called in the big.

There is some sort of betting on the 10s-7d-2d flop. Chris bet again when the 7c came on the turn. Chad moved all-in and Chris tanked.

Now. There is a good 11K in the pot and Chris would be left with only 4K if he folded. Yet somehow, he did and Chad took the pot.

Yo no comprendo.