I'd like to see another replay, but to me, it looked like Willis bent low and as you said, hesitated a blink. I think Drew expected his stance to be a few inches higher. Bledsoe, as most QB's, expect the RB to be in a certain position to take the handoff. Willis was already into his run.
I wouldn't worry about it. The guy has what, six games? Pretty minor transgression for essentially a rookie.
Oh, forgot. Cut both of them.