Depends. If he threw the gun down and surrendered prior to being caught up with, I think it would most likely have ended with words. Then Ro would have to decide if he's gonna pick up that gun and become a target for LE.In your mind, what was the likely outcome of Rosenbaum catching up to Rittenhouse if Rittenhouse did not shoot him?
Also, who was the aggressor? Kyle or Rosenbaum in this situation?
K wasn't a member of a rival gang. He was a weenie and no glory for beating the guy up. Once owned and separated from his gun, I don't think there would be much incentive to go farther. There's more risk legal risk for beating up a much younger kid who doesn't appear to have ties to the street -- gangs, drugs etc.
If he lost control of the gun when Ro grabbed it, I think that could have led to getting pushed to the ground or punched, but I give a full-blown beating 1 in 10 odds, and hospitalization or death, lower than 1 in 100.
Ro was clearly the aggressor when he pursued a guy who was running away.