Glad neither you or your dad were hurt.
You say that you never saw the idiots that shot at you till after they started running away.
Well that's the problem with the concept of long range defense. It's pretty easy to hide yourself at that distance. Difficult to fire back when you don't know where your attacker is and relatively easy to take cover if you're not wounded.
To fire back at that distance exposes you to his fire. This is a case where discretion is the better part of valor, just get away.