Instant Defense?, What can I do against sudden attack? Options

Today something happened that caught me off guard. I was in a parking lot with my father, helping him with his shopping. He had a difficult operation recently and has trouble walking. That is why he parks close to the entrance of the mall.
When I put the bags into the car, a woman came up to me, chiding me for parking there. She did not even ask me anything, she just judged and attacked.

I explained that it was not my car and that my dad has had an operation and can't walk far, but she did not listen and shouted at me. I could not see anything unusual, but I felt her aggression and bad vibes. Her mother joined her, and they both started attacking me verbally. I've been in arguments before, and usually I stay calm, but this was not a normal argument. I've never felt that helpless and aggressive in my life, there was definitely some kind of psychic attack going on.

I'm not usually aggressive, but I felt very aggressive towards them. I didn't recognize myself any more because I'm normally stable and balanced and I don't let people get to me like that.
My father came and ended the argument by offering to leave. I had the strong impulse to stay between him and them because I somehow feared they could do something to him.
No, this definitely wasn't a normal argument.

When I was alone, I almost started crying, for no apparent reason. I used my instant magick trigger and visualized three rings of blue light around me, repeating the phrase "Thrice around the circle bound, evil sink into the ground" three times, only then did I manage to calm down.
I do energy shielding regularly, but this time it was like the shield wasn't there at all. I'll definitely work on my shielding technique (I've already discovered the shielding thread in this forum), but:

(IMG:style_emoticons/default/help.gif) Is there any instant magick I can do against this kind of attack? Anything I could have done right there, in the parking lot, other than running away?

I thoroughly disagree with DollHouseKitty. One should not adopt the attittude of tit for tat because it smacks of immaturity. Instead I suggest that take a pan of salt water & throw in it all the grabbed negative energy that you can garner & collect through sweeping your various chakras. Evil salt water should then be thrown into sea or a deserted place to be absorbed by the mighty sun. Also beam healing energy to the perpetrators.