Would you be a good eye witness?

So, today I had the disturbing experience of shopping at Target and having a dirty, old man look me up and down and then make a perverted comment to me. After he said it, I was so mad that I turned around and yelled at him, "You are disgusting! How old are you anyway?" Then he dodged into the men's clothing area and I went and found my sister who was shopping with Bella in her cart. We had split up so that I could look at birthday presents for Bella. Anyway, my sister encouraged me to go tell the store's management (since they happened to not have visible security on at that time). So, I did and when asked questions such as, "What was he wearing" I realized that I didn't really have a clue. Just non-descript "darker" clothing was all I could come up with. I knew he was "old" because when I saw the sprinkling of white in his hair, that is what prompted me to try to shame him by asking how old he is. I walked around the store with the manager a few times and didn't see him again, although I saw one man that I thought could be him, but I didn't think so. It made me realize how difficult it is to be an eye witness. With the emotions of the experience raging, it seems to cloud the memory a bit. Although I have a feeling that I could pick him out of a line up. I bet that seeing him again would prompt my memory. Anyway, the adrenaline was certainly pumping a little faster for the rest of my shopping experience and I started to think of how much I wanted to slap him or hurt him in some way. Really, I'm not a violent person but it just made me think about all of the sickos in the world, and especially those that harm children. So, sorry about the "downer" post today. Just wanted to vent and bring up the idea that it isn't so easy to be an eye witness to something that happens so quickly. Have any of you ever had to be a witness to a crime or an accident?