For arman, medics can be killed if you destroy someone's car, being a medic or firefighter doesn't make you invincible with the rules and as a medic you are supposed to save lifes not to take them but you may still be able to do self-defense if they attacked you first.
And for frost, revenge in the rules only is for killing, if you got killed by someone you may kill him after, doesn't apply to this car wreck, you should revenge to the cop not the medic, and yes you may shoot arman at that time if you didn't die, put a bounty instead and let someone kill him.
Both sides did some mistake I won't punish anyone but take this as a warning if this happens again then you might get punished.
End of case.