Some elements in The Duskbloods were pulled straight from director Hidetaka Miyazaki's experiences playing tabletop RPGs, which might just explain why you can propose to an enemy player mid-match.
Speaking to IGN, FromSoftware boss and game director Hidetaka Miyazaki says "there are two points I would say that can specifically be pulled from the board games." Instead of winning multiplayer matches by simply beating everyone else to a pulp, The Duskbloods asks players to earn Virtue by completing side objectives or killing mini bosses that stomp around the map or holding king of the hill-style zones, let's say.