Are we watching the same clip? Both refs who should have been getting in there are not doing so. The Lead is only sticking around because he can't seem to locate the right number. The C (who inexplicably had a whistle despite the play being in Lead's lap and having two players between him and the foul) isn't getting in there either. Hanging back and watching the players to make sure they behave is not the best thing to do here. The only dude who seems interested in getting in there is the freaking Trail!! Lead needs to be right there and let his presence be known with C right behind. That leaves Trail to hang back and observe the whole group of players.

I could see either of these as intentional based on excessive/WIF contact. Sure it's clumsy and perhaps not deliberate but those are not our criteria.