Which is why Trump walking away from the debate changes the dynamic. He smelled a trap and said no deal and they were begging him right up to the debate and it never hurt him. It most likely helped.
I think going on BOR the night before and way he hosted the Vets event fixed the damage. The Vets evernt was suberly managed. Trump was smart, he stayed OFF camera a lot of the time and let Huckabee, Santorum and the Vets do most the speaking.
I think the anti Trump team has it half right. Ducking the Debate should of hurt Trump but because of the way he managed it, it will not.