Not a soccer person at all. But to get a yellow card for a soccer equilivent PF, it's basically borderline 'dirty' play, yes?
I'm a soccer ref and a football fan.
One of the seven reasons for a caution is unsporting behavior. One way to be unsporting is to recklessly foul an opponent Of the 10 penal fouls, 7 can be committed carelessly (simple foul), recklessly (caution/yellow card) or with excessive force (send off/red card).
A reckless foul is one where the offender has not considered the safety of his opponent. Typically this are late hit type fouls, non-thrown elbows, or tackles from behind not involving studs or straight-legs.
There are 7 ways to be sent off in soccer.
1. Serious foul play - a foul committed with excessive force while challenging for the ball
2. Violent conduct - any violent action directed towards anyone. It may or may not be a foul.
3. Offensive, insulting or abusive language.
4. Spitting - at anyone. Only a foul if at an opponent.
5. Denying an obvious goal scoring opportunity by fouling an opponent. This does not have to be tactical or intentional. It can be as simple as accidentally tripping an opponent from behind. The equivalent in football would be ejecting every time B fouled in the end zone or fouled A when the runner had only one defender to beat.
6. Denying an obvious goal scoring opportunity by handling the ball.
7. Receiving two cautions in one match.
So the bar for a send off is much lower in soccer. I've seen HS football refs not even through flags for actions that on a soccer field would be viewed as violent conduct and result in an ejection.