The play clock and the time clock are still independent of each other. Previously, a first down (or any play) out of bounds still had the 25 start on the ready, though the time clock was off. You can still have the 40 start at the end of a play that gains the first down. The only question is, what is the mechanic. Is the umpire the one that's going to initiate a 40 second clock start? The other problem is, what if the R isn't able to blow the ready, for whatever reason, with the 40 second clock in its waning seconds?
Honestly, in my games as R, this may slow things down. It doesn't take us 15 seconds to unpile, spot, and blow a ready. Especially on plays ending in the flat. I try to work pretty fast.
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