This is tough. If it was only 15 yards and automatic first down then any DB would just tackle a guy if he was beat. You would have to have two types. Intentional and incidental. Incidental is 15 and automatic first down. Intentional is spot foul and automatic first down. But then it adds more subjectivity to the referees, I believe we actually want to do the opposite. It’s already hard enough to officiate a fair NFL game with all their subjective penalties.