Shoomoon
honestly, I'm a bit tired of the perceived trauma by all MC's. the trauma dealt by taking a life is directly related to the value in which the MC has for said life so for an MC who has just transmigrated and is still unconsciously viewing people as NPCs it's not logical that they would feel anything. if anything they would question if the fight was a staged instance and the mission and rewards from the system would further fortify that idea.