"Just wondering, does your momentum and speed amount to the damage you do?" I think this question is grammatically incorrect and utilizes the wrong grammar, because I don't know what the heck you are trying to say.
Well, we don't know YET as PontyPants hasn't added a Healthbar or Stamina bar to the demo.
In his "Learning Unreal Engine for 6 months (and making a game)" video, he added a healthbar and some UI to show the players how much damage they took, But it doesn't seem like there is a healthbar or health UI in this demo.
But maybe the reason why he didn't add it was because right now we are using a dummy character as the other player in the Demo and not an actual player and/or AI, so that's probably why we don't have any health recognition or UI.