Hi, native portuguese speaker here. I'm not all that great with lip reading, but I can sure attest to you guys that there were no soft words thrown around during the staredown. I can't give you exactly what they said, but I think I got a few...
Vitor: Keep talking asshole
A.S: I'm gonna fuck you up
Vitor: Then let's go. FUCK
Afterwards, during the quick 1 question to A.S, Soares translated the response as: "I don't know what's gonna happen, but you guys will watch a great fight".
The ESPN fellows got it a little better... but not quite on the money, what he exactly said, was:
"I don't know how it's gonna go down, but we're gonna beat the shit out of each other. It's going to be a brawl"