I have clips of luvnest doing even much more on spot MG turns than that. specially in game where he played vs Jesulin as USF.
You guys are just seeing things you want to see.
Here is the Luvnest example https://youtu.be/-LwgKnwtqtI?list=PL5Gq-kPFBcWF8NW9r1HtxeSKSGTEYze7c&t=3773
Luvnest not only turned the mg, he even activated incendiary rounds.
There is literally nothing suspicious about this clip? He poked his head around the corner with the rifles then moved back again. Even if Luvnest didn't notice that, it's the opponents cutoff and that was the only direction infantry squads could be coming from.