More details on the brawl came out via FrontRowBrian, a ticket industry operative who also operates as something of a guerilla MMA reporter. He has a good relationship with Sonnen so that could well be his source:
FrontRowBrian @FrontRowBrian1 hr
Chael and Wand were fighting. Chael was on top of Wand. Wand’s coach comes and punches Chael in the back of the head. He’s okay though
FrontRowBrian @FrontRowBrian1 hr
#TUFBrazil has been an clusterfuck from literally day 1. Horrendous move by to even do this. Chael/Wand fighting not even most shocking part
FrontRowBrian @FrontRowBrian11 mins
Details RE Chael/Wand fight. Wand threw looping punch, Chael ducked, double legged him. GNP. Then Wand’s goon punched Chael bk of head
rontRowBrian @FrontRowBrian11 mins
And then a bunch of people swarmed in and broke the whole thing up. #TUFBrazil
FrontRowBrian @FrontRowBrian8 mins
No. His head is sore though. RT @iamKokoD: @FrontRowBrian @MMAG33K was Chael knocked out by the cheap shot?
FrontRowBrian @FrontRowBrian2 mins
The coach who punched Chael Sonnen in the back of the head was Andre Dida. Used to coach Shogun too. Fought in Dream.