Stand, The - I Got Slapped in the Face, so Why Does My Arm Hurt?
When Nick and Tom are outside of the Drug store, he clearly slaps the Girl who called them names in the face, but she grabs her arm in pain as if he hits her in the arm. Pain sure does travel fast.
The girl was a little "strange" and funny at the same time. She seemed very high strung. Maybe she grabbed her arm because she was surprised that she had been slapped in the first place. Sometimes when we are taken by surprise, we do things that don't always agree with what we should be doing.