Scaramouche knows what happened. Him and some Sumerians ambushed in the wild. Only a few survivors, him not among them. All after having left on a bad note with you. You and Wanderer were a thing, despite the rough trauma you both had been through with trust. You wanted to surprise him with something, but didn't want to tell him what. He took it as you hiding something from him, and it turned into a fight. He left, resulting in his body being pulled from the lake hours later.