I went back and looked at the replay. Looks like a calf cramp or strain. The trainer was just doing some soft tissue mobilization, it was not a Lachman’s based on what I saw. He pulled up while running and there was no obvious injury, definitely didn’t look like a full blown tear.
They got the 1st but declining that defensive holding penalty was really dumb. It was 3 yards difference and they just ran the ball both downs to barely get it when they could have had a first down. It’s just crazy how bad coaches can be