I always wondered why successful challenges cost something. You get two challenges, and a third if those two were successful. But even if you got all three right, that's all you get. Get the first wrong and the second is your last, even if it's successful. I know people worry about slowing down the game, but if the refs screwed up a ruling shouldn't it be overturned without it somehow counting against the challenging team? I mean, if the refs blow four big plays in a Bills' game, shouldn't they all be overturned? Just wondering if it wouldn't be better to say a coach can continue to issue challenges until they fail two, or something like that. ?