Frightened

I encountered a robbery tonight as I was dining in a McDonald here in Jacksonville. I didn't see the robber came it. When I noticed him, he's robbing the purse of a lady about 4 tables down, and then he ordered a man waiting in line to buy food to give him his watch. He robbed the cash registers and left through the back.
I was safe. I didn't lose anything. The robber didn't even walk over to my side.
The lady who was robbed is dining with her 2 sons, one is 7-8 years old, the other is 3-4 years old. The younger son didn't know what happen, but the elder son is so freightened that about 2 minutes after the robber left he suddenly cried hyterically. I was frightened too, but I can mostly contained myself.
I am thinking, if Alpha or Archer is here, what will I do to protect them? Will Alpha know what happen and be frightened?
I hope that they'll never have to go through this.