I heard the video.
It sounded familiar. Years ago, I had a Chinese SKS that was my “farm gun”. One day, my father asked when it became full automatic.
The sear was worn down, and one trigger pull would start it firing and not stop. Wasn’t a high rate a fire, but it sounded very similar.
Yeh I just posted that same theory on another thread. It sounded like an AK to me and it was making a clacking sound like maybe a cheap Chinese AK. But you are right if he messed up the sear pin when he took off the safety it would fire til the mag was empty. He sure didn’t fire 800 round in 10 minutes from one AK. The barrel would have melted down. Must have been using two weapons and moving from one window to another.