From FBRSS.......DYNAMIC FOOTBALL STATEMENTS

A block in the side is not a block in the back.

Force is blamed on the initiating team until the ball hits the ground.

Players shall on rough the passer, kicker, holder or snapper.

A substitute can't be off sides.

Pass interference can only occur beyond the neutral zone.

The team that initiates play can't go out of bounds and return.

A kick is a kick until possession.

After a kick is possessed, it is a running play.

Treat short field goals like a punt.  Team R can recover & advance and Team K might 1st touch.

If a false start causes Team B/R to encroach, only penalize the false start.