Common Fantasy - Not an Excuse, But a Reason
 
Sorry this is so messy and smudgy. But I wanted to get this idea out so I wouldn't forget about it. I've decided that when Vya got his scar, it was his friends who gave it to him by shoving him into a concrete wall or something. Matvei played his part: he was the one that told Vya's gang to show up and manipulated Vya into exposing his gayness, but the whole thing got way out of his control.