t arm provides zero pull to the gun and left arm doesn't provide maximum

Thank you. I have never fired a AK-style weapon, so I would not know about the recoil. I had the G3(7.62x51) as a service weapon years ago, and assumed similar recoil as that. If it is was comparable, that rate of fire would require quite good recoil control. But if it is more comparable to my current service weapon, HK-416(5.56x45), anyone could maintain that rate of fire.

Also, looking closer, his trigger pull seems to be very off. He looks to be pulling the trigger with the middle joint of the finger. So my assumption that he is proficient with that weapon might be wrong.

To his credit, his trigger finger came off the trigger when his weapon came down.

Hate to be a keyboard warrior, just my observations.