Quinn said that Manning has the ability to quickly spot the open pass and it is up to his team to force him to act more quickly than he usually would.
"He has just great mental quickness and knows where to go with his eyes," Quinn told NFL.com. "This is going to sound obvious, but he throws to the guy that's open. It's not quite that easy, but how does he keep getting it to the right spot, to the right guy?
"If we can hold that extra click, that's what we know is important to us."
Manning has played for the Broncos since 2012.