1. A80 fouls when he returns inbounds. That five yard penalty can be enforced at the dead ball spot (A-49) or previous spot. It can NOT be enforced at the spot of illegal touching because accepting a live ball foul cancels the illegal touching. So B's options are either A 4/15 @ A-5 or B 1/10 @ A-44, clock on the snap either way. Technically, B 1/10 @ A-47 is an option, but they'll never take it.
2. Incomplete pass, B 1/G @ A-3. The punter is the player to originally control the snap and he never gave up possession so he gets the exception from intentional grounding. He leaves the tackle box and throws the ball beyond the line of scrimmage, so there's no foul. This is just an incomplete pass.