I can't understand how everyone wants to blame the whole thing on the Manly players.
To me by far the most culpable player is Blair. The whole reason this escalated from the initial Lussick/Hinchcliffe fight was because of his filthy king hit. That was what incensed G. Stewart and you could see he was still itching to get at Blair when he was sin-binned. That alone is as bad as what Brett Stewart did, and it landed cleaner as well.
Then, the second fight started because Blair ran 30 metres to catch up to Stewart and initiate the confrontation with him. I don't know why we are all wondering "what did Blair say to start Stewart" or whatever, the second fight started when Blair fronted up to Stewart and pushed him- it was on from then and Stewart got the first shot in, but it was Blair who went out of his way to start the fight, which should be seen as a pretty serious offence for a guy who has been sent from the field.
As for the Manly players running in 4 or 5 on 1, I don't really care- as with Stewart throwing the first punch, it was simply a case of them getting there first- it was always going to be an all-in brawl once the second fight started. It's a team sport, not organised fighting, and the Manly players had every right to want to charge in and get stuck in to Blair. Obviously if there were blokes in there king-hitting him while he was defenceless that will have to be looked at, but I'm not sure it was that clear-cut.