The only thing I will not accept is cowardice, once they've made the mental decision that things are to much for them and they don't like the sharp end there's no coming back. I don't mean they walked because they couldn't work out where their fox had gone or they lacked the confidence to push tight, I mean outright spew or refusal to look at the game.
We've all seen that sullen look they give you, tail down low slung sulking b*****ds almost like they're ashamed of themselves, if I see that then it's down the road.