TMO's and Refs can hand out a Red card maximum on field.
If they decide it's red, then WR examines if afterward and say it wasn't they are slammed. If they decide it might be but err on the side of safety and WR with a million cameras and hours to pour over the converage, say its' red, they get slammed.
If they issue a red on field, it's game over for the other team. If they issue a yellow on the safe side, then at least they didn't completely kill a teams chance of winning or losing the match.
There is no win no matter what.