Osweiler was warming up on the sideline with the possibility of the Broncos getting the ball back with under two minutes to play. In that situation, Osweiler would have thrown what figured to be, after the punt, a pass of around 70 yards. The Broncos trailed the host Falcons 27-21, and it would have been Osweiler's first regular season snap as a pro.
He told the Denver Post, "I was going in for the Hail Mary," Osweiler said. "I'm not sure what the dividing line was as far as me going in, but I was getting ready to go in."
Osweiler is known for having a very strong arm, and the 35-year-old Manning has said he's still getting his arm strength back after multiple neck surgeries kept him out of football in 2011.
Atlanta's Michael Turner rushed for a 15-yard gain with 1:54 remaining, and Osweiler never appeared. The Falcons knelt it out after that, taking the win to move to 2-0. Denver (1-1) will host Houston in Week 3.