for a split second, and then acts like he's passing Hill off to somebody, except there's nobody left on defense behind the LB.
I get it on the goal line and/or short yardage. You have to commit to stopping the run which leaves you vulnerable to a TE swim move to the outside. But in that situation? He's an eligible receiver. You can't have a LB who has some other assignment to get to rather than covering an eligible receiver.
I'm going to go with the LB forgot what the defensive play call was and that there was nobody behind him to cover Hill.