Joseph Oduro was leading a study group at Brown University Saturday when a man carrying a gun walked into his classroom. He tells ABC News' Whit Johnson about the moment he looked the gunman in the eyes:

Rayan Cherki. Incredible. 🚀🤯 #RayanCherki #ManCity #Football | manchester city vs brentford

Erling Haaland Scores Amazing Goal for Manchester City

Did you notice the way Cami kept staring at Tommy No one realized that she had already decided to push him out of M-Tex.#usa #foryou #fyp #us #landman #tommy #oil #dannymorrell #cami

I visited Two Collide Planets In No Man's Sky for the first time And This Is what it Looks like From the inside! #nomanssky #nms #gamingcommunity #spacegame

He Found A SPECIAL Mysterybox That Had Been DISCONTINUED #stylinboxes #mysterybox #mysteryboxes #convention #strangerthings #jurassicpark #chainsawman #onepiece #dbz