So you go out of your way to use the service of the streamer, you are in their chat, and they forget to drop lines into a fight where the opponent didn't mind (this is very easy to prove if you are in-game as their opponent) and instead of telling them in their chat you act like their enemy, don't tell them but take their own footage to the admins to get sanctioned?
Seriously, we want to promote streaming, I can tell you that it is actually very taxing to pay attention to the stream, comment and interact with stream chat and the game as well, especially if new streamers come along I sure hope staff will take the route of PMs and chat members of talking in chat about mistakes and will not use evidence against streamers for easy to make mistakes like this. It happened to me too before - when I stream the chat just tells me because they are your audience and they know you put in effort for them.
They are not above the rules - the people who played against them can get them sanctioned easilywith just chat logs - there's no need for evidence from the stream if they actually faced them - I sure hope staff will reject someone silently stalking people's streams looking for mistakes using their efforts against them.
Even what happened to Alucard from his videos with the very rushed sanctions that got overturned - you know who the person is, talk to them, it's not rocket science - you know who the people are who put content out there, approach them first, act later.