Set for one second

[PiggSkin]

I was watching the end of the Texas/Texas Tech game, and TTU was in hurry-up mode trying to get the tying FG... On one play sequence, Tech got a first down and was tackled inbounds... The clock stopped for the chains to move... As that was happening, Tech runs up to the ball and gets set... They're set for a few seconds when the RFP blows... Almost immediately after the RFP blows, the ball is snapped and spiked by the QB... (It almost looked like the whistle was the cue for the ball to be snapped...)

I've always assumed that the offense had to be set for one second after the RFP and before the ball is snapped... Was this just a faulty assumption on my part..?

(I also realize that there are often glitches and delays happen with the sound when watching on TV... This may not have actually happened this way... But for the sake of discussion, assume that it did...)