My Eagle Eye was way off today

So for work I like commuting on the BART, it saves me money and I don't waste mileage. Last week I saw my pops on the same damn train I was on. He was in a different car, but my eagle eye was able to detect his ass. He didn't see me so when we got to our destination I just stayed back and made sure he stayed in front of me. Today however, my eagle eye completely failed me. I'm usually keen on being aware of my surroundings wherever I am. I am able to pick up alot of details in a very short amount of time. So you can Imagine my dissapointment when I didn't even notice that my dad was in the same car as I was for 20 minutes (about half the trip). Not only was his seat facing the area I was at, but I also was standing up for about 10 minutes of the trip. For those 10 minutes I was completely exposed. I was seated by the time I noticed his presence. When I noticed him I wasn't sure if he had noticed me. To make sure that he didn't see me though, I hid behind the guy in front of me. I kept wondering if I he had seen me but I could never come to a conclusion. But it was clear that he did when he got up to sit in the seat next to him to get a better angle on me. So from that point I had to put together a plan to avoid him. For some time I kept avoiding eye contact and looking up all together. Then I finally saw my oppertunity to make my move. When the train stopped at one of the stations, the girl next to me got up to get off and stood by the door, alot of other people also got up and stood by the door. So I did what he has done to me and my bro many times, left while he wasn't looking. After that it was just a matter of staying behind him and making sure he didn't see me, which he didn't. I was able to escape yet another close call, damn my eagle eye....