Thomas was clearly playing down and in, as if he was looking for a crossing route and expected Bullocks to cover it up top. And Bullocks bit on the play-action. The question is
1) Was it a coverage call that just sucked
2) Was it miscommunication and Thomas shouldn't have expected Bullocks over the top
3) Was it a mental lapse on Bullocks to bit so hard on the play-action when he had deep coverage responsibilities