He is hearing footsteps that aint there. You can't keep this kid out there. If he is not willing to stand in there to try and deliver the ball, he literally gives you nothing else. The sack on third and one, was a bad play call, but Mac's eyes are on the rush first and he is feeling outside pressure before its there.
Additionally, the team looks like it is going through the motions. They need a spark just for morale. Sit Mac.