Found this online... seems assessment depends on the spot of the foul and because last nights foul was in or beyond the expanded neutral zone it should have been assessed "psk" post scrimmage kick. So Forrest ball 1st and 10 after 15 yrd penalty.
Example: Fourth and 10 for team K from its own 20 yardline. While K1’s punt is in flight, R2 blocks K3 below the waist. The foul occurs at team K’s (a) 18, or (b) 23 yardline. R4 makes a fair catch at the 50 yardline. Ruling: R2’s block is illegal and occurred before the kick ended. In (a), because the spot of the foul is behind the expanded neutral zone, PSK does not apply. The penalty is marked off 15 yards from the previous spot. That gives team K a new series at its own 35 yardline. In (b), PSK applies. The penalty is enforced from the end of the kick. It will be team R’s ball, first and 10 at its own 35 yardline.
If PSK applies and the kick results in a touchback, team R’s 20 yardline is the basic spot