If I were manager I would have to convince myself one way or the other, but as an outsider I simply go back to giving the benefit of the doubt. If the doctor has told you as a player, "one bad dive and you're finished", and you are forced to be ultra careful about not letting balls get by you yet staying on your feet, then you let some drop that another player would try for. If that's loafing, well, we need a pair of words to cover both this and what I consider the usual meaning.