"They didn't play golf, Hamish said he wasn't sure where they (West Coast) got that from."
In contrast to Nisbett's comments, Angus pointed to his family being livid about the incident and hinted his family could take the matter further if the AFL Tribunal didn't come down hard on Gaff, who's out of contract at the end of 2018 and unlikely to play again this season.
"Imagine if this has happened at a nightclub or on the streets, it's an assault," Brayshaw said.
"I'm not a lawyer … but you could probably get in jail for something like this, I would imagine. The one-punch thing has been a huge campaign.
"I just can't believe, honestly, that it's happened. I'd be really upset if he gets less than seven (weeks). If it's anything less than seven, someone should do something about it.
"Hopefully it is sorted out by the tribunal and then we can move on from it."
Despite surgery and being ordered to eat no solid foods for four weeks, Angus said his brother wasn't out of the woods with the injuries he sustained from Gaff's callous punch to his face in the third quarter of Sunday's match at Optus Stadium.
"He's battling at the moment with what happened," Brayshaw told AFL Exchange. "He's had a few little things he has had to work through. He had surgery that night, issues with his teeth seeing a dentist a bit [and a] sizeable chunk of his lip is in trouble. I wish I could be over there with him. It's a terrible thing he's had to go through.
"Obviously his health is at the forefront of everyone's mind and hoping he's okay in the long term.
Angus also took a swipe at people sticking up for Gaff's good character.
"People say he'd never do anything like this, and character references are a thing in the tribunal but from what I can see ... I'm watching this thing, he's squared up to him," he said.
"As far as I can see, he's looking at him and then just absolutely ruined Andrew's mouth with his fist.