Could you draw me a picture showing how it was that Hakstol signed a new contract after negotiations ended? The way I see it, for negotiations to be over, the two sides negotiating (i.e. Hakstol and UND) both have to stop negotiating. Obviously, that didn't happen.
The e-mail published by the Herald shows that Hakstol wanted to stop negotiating after he received an unacceptable offer from Buning. That result wasn't acceptable to UND's administration, which then stepped in and came up with a better offer. So while Hakstol may very well have thought that negotiations were over until after hockey season, they weren't. The fact that he signed a new contract before the season started proves it.