Pettine was so upset over it, he was going to pull out of the Browns job after the 2nd interview because it was 'unfair' to the Bills...
"The Browns hired Pettine after he (nicely) gave them an ultimatum. He didn’t want to keep the Bills hanging on any longer, certainly not beyond the Super Bowl.
He told the Browns after his second interview ended without an offer that he’d have to pull out if he didn’t get the offer out of deference to Buffalo head coach Doug Marrone(whom the Browns badly wanted to hire as head coach last year).
At the point of Pettine’s demand for an answer, the best candidate was another defensive coach, Seattle coordinator Dan Quinn. That made it easier to justify Pettine, who didn't interview anywhere else."
http://www.cleveland.com/budshaw/index.ssf/2014/01/cleveland_browns_---.html