How could I make two players with same Blueprint fighting on Multiplayer

Hi guys !

I’m a beginner and there’s something I don’t understand in Unreal Engine. I created a player which can throw a projectile and I want to test my game in multiplayer. So to do this, I launch the game on “play as listen server” and there’s two instance of my player which spawns (the player 1 which is actually the server and the player 2 which is the client).

Now I want my players to fight but as I said it is the same Blueprint so they belong to the same Object Channel that I called “Player”. How could they hit each others in this case ?

Thank you and good night !