I have, his mate was getting his head bounced off the hard pavement as the other guy had him pinned down... is that not also a shithouse move? The kick makes the guy in grey slump over and someone else kicks him in his side.
Would a punch have been better? Both inflict damage both can be fatal if you are unlucky. He could have just pulled him from ontop off his mate but that guy was definitely going to go straight for Denayer had he done so thus putting himself in danger. Does he have to let a guy who's happy to pin someone down so they can't move while they reign punches down, up for a fair fight to inflict damage on someone else? It all depends how it started, he didn't seem like a fair fighter, possibly ambushed his friend unawares.
It probably will cost Jason a lot having got involved in this way but if his reasons were genuinely to prevent his friend ending up in hospital or worse, I don't think any blues should be condemning him or disowning him.