Doss told the Baltimore Sun he was at a Five Guys restaurant Thursday afternoon when two men attacked the 34-year-old manager. One of the men cut the manager on the chin with a knife before the two assailants fled.
Doss, a 21-year-old rookie from Indianapolis, was not seeking to play up his actions as heroic.
"It was two dudes on one. I was trying to help the situation out. I broke it up," he said. "I saw the guy on the ground bleeding, and I saw a guy on top hitting him."
Police told the paper they believe one of the attackers was angry over being fired from the restaurant. The manager was treated for a minor cut and released.
Doss had tweeted about the incident shortly after.
"Jus had to break up a fight at five guy. Baltimore is too ratchet!!!"
Doss, a fourth-round pick out of Indiana, is battling to be third on the Ravens' depth chart behind starting wideouts Anquan Boldin and Lee Evans.