Running play. Live ball foul. Based on your description, if the foul was a BIB, it would be 10 yards from the spot of the foul, next down. (1st if LTG was made following enforcement; replay previous down if not).
Crew needs to make up their mind if the foul was an illegal hit on a defenseless player, targeting, or a BIB. Either way, the score does not count AND the penalty does not carry over to the try or KO.