Some people call this the “Now” screen but it is just basically getting the ball to the WR as quickly as possible. The Flash is a part of every run play or in this case every pass play. If the the QB expects blitz vs a Dropback pass, he can throw Flash.
Anytime the QB sees “8 Between the Slots, throw quicks & hots” whether it’s a called run or pass. This puts speed in space and makes CBs tackle