When Kelly communicates with his quarterbacks it's as distinctive as the "S 8" on the back of his play card.

"It happens fast and he gets really excited, especially if we hit someone with a big play and we're coming back fast, he is just screaming in your ear," Bradford said. "You can tell he's excited, he wants to get the play run. I think it's good because as a quarterback I can tell through his excitement that it's my job to push the tempo, it's time to get rolling. . . . 'All right, let's go, here we go, here's the next one.' "

Kelly will hold a laminated card that is roughly 14-by-11 inches over his mouth as he sends in the play, often with a "high-pitched scream," as quarterback Matt Barkley called it. Off to his side are the four signalers dressed in black except for the red wristbands meant to draw attention to their constantly motioning hands.

The signals are for all the players. The quarterback has Kelly in his ear calling the play or he can get it via hand signal. When Kelly came to the Eagles he spent much of the two extra weeks he was afforded as a new coach teaching the players the new signals.

"I was so uncomfortable with that because I hadn't done it since college," former Eagles quarterback Michael Vick said. "I'm saying to myself, 'I could be spending more time learning the offense than learning signals.' . . . I think me not wanting to do it took me a little longer, but I realized that if I wanted to be in contention for the quarterback competition, then I needed to learn."

It's all done in the interest of time as Kelly pushes the tempo.

YONG KIM / Staff Photographer Kelly watches his players play the Jacksonville Jaguars on Sunday, September 7, 2014.

"The key is if you run a lot of plays, you can call crappy ones," Kelly said. "So if you're a team that only runs 50 to 60 plays a game, you almost have to hit on every single one of your play calls. If you can get 85 to 90 play calls, you can have 25 to 30 not very good calls, but they tend to forget about them because then the next play got your first down."

There is a brief pause once the official whistles for the 40-second play clock to reset. Kelly then clicks the remote button attached to his right hip and rattles off the play call. He has up until 15 seconds are left on the play clock before an NFL employee switches off the headset.

Kelly doesn't need that long. His calls are shorter than most. Many West Coast systems, like Andy Reid's, for instance, double his verbiage.

"In Chip's system it may have been maybe six, seven words max in the entire play," Vick said. "With Andy, we sometimes had 12, 13 because we called the play, the motion, the formation. And if we had to tag somebody in the route, we would have to call out the play we were tagging."

“He can see what’s going to happen, and so the calls are already in line.” Sam Bradford

Kelly makes the call once, maybe twice. If the quarterback doesn't hear it, there's a signal he can give to get it again. The fast-talking Kelly never hems and haws, the quarterbacks say.

"It's decisive," Bradford said. "It's like he already has four or five plays in his head. It's like he can see what's going to happen, and so the calls are already in line. Whether it's a run or a completion, whatever, he's already got the next one in his mind. That's what it is and we're going."

If there's time for more information - remember, the Eagles are typically moving at warp speed - Kelly will give the quarterback a "heads up." He doesn't want to overload him with too much data.

"He's either giving him the red flag, 'Watch out for . . .,' or he's giving him, 'I'm calling this play looking for this . . .,' " Bible said. "So here he goes, 'Rhino-82, heads up on the free safety, deep post.' What he's saying to you, quarterback, is, 'I'm calling this thing because I'm looking for the post.' He's either doing that or he's going, 'Rhino-82, watch out for the free safety blitz.' "