“Any time a ball carrier
begins, simulates, or fakes a feet-first slide, the ball should be declared dead by the on field officials at that point. The intent of the rule is player safety, and the objective is to give a ball carrier an option to end the play by sliding feet first and to avoid contact.”
Don't expect any Kenny Pickett copycats to work out.
sports.yahoo.com
This is actually not the rule, as written, but after actually reading the rule online, I admit I am wrong and if does say if a ball carrier "obviously" begins a feet first slide
When any part of the ball carrier’s body, except the hand or foot, touches the ground or when the ball carrier is tackled or otherwise falls and loses FR-62 RULE 4 / Ball in Play, Dead Ball, Out of Bounds possession of the ball as they contact the ground with any part of their body, except the hand or foot [Exception: The ball remains alive when an offensive player has simulated a kick or at the snap is in position to kick the ball held for a place kick by a teammate. The ball may be kicked, passed or advanced by rule] (A.R. 4-1-3-I).
When a ball carrier obviously begins a feet-first slide. Any time a ball carrier simulates or fakes a feet-first slide, the ball should be declared dead by the on-field officials at that point. (A.R. 4-1-3-III and IV
Still tough to see where it obviously begins. I would say when the slide starts, when the feet are in front of him. Plus, there was no good angle, so wherever the ref, that was 10 yards behind the play called it, whether he gave him a first down or not, probably would have stood on replay.
It is obvious that he would have gotten the first down however, and he went down to kill clock, not to save a hit, as no one was near him.