[coyote6]

Technically, Roll with Blow is cinematic, so you might need the Unusual Training perk for realistic games.

The double knockback bit is probably a little much in some cases, at least for realistic games. Though if you reskin egregious amounts of knockback as "scrambles back before being hit and falling down", it might work for football QBs. :)

But even high school players get knocked down, too, mostly don't seem to require heavy medical aid after every game, and ought not to have many points in skills, techniques, perks, etc. Hence, I wouldn't focus on fixing it solely for football players - they were just a handy (if slightly sad - 49ers fan, here) example of people who get knocked down a lot, without suffering that much damage.

Maybe just use the effects of roll with blow: half damage, but check for falling down if rolled damage > 1/3 HP.