I did see something enter the picture but I did not focus on it so I had no clue it was a gorilla. In the second vid I noticed the change, but did not trust what I thought I saw.
The whole thing really speaks to the multiple attacker scenario. I know my ability to hit what I aim at has a lot to do with focusing on the target. It was eye opening. I did not read all of the text so I did not see if any exercises were given to help see better if possible.
I work on getting shoots on target quickly and getting cover or out of the direct access to the attacker. Sd has so many different aspects that one could never really train for everything you just gotta hope whatever you train/practice would be of some use if you need it, but how do you train to see better.