Arnulfo Reyes, the fourth-grade teacher in Room 111 at Robb Elementary School, spoke with ABC News exclusively about what happened when the gunman opened fire in his classroom.

WATCH THE FULL EPISODE OF 'WORLD NEWS TONIGHT':
https://bit.ly/3uHCDO5

WATCH OTHER FULL EPISODES OF WORLD NEWS TONIGHT:
http://abc.go.com/shows/world-news-to...

WATCH WORLD NEWS TONIGHT ON HULU:
https://bit.ly/3iQLwPp

#WorldNewsTonight #DavidMuir #RobbElementary #ArnulfoReyes