Unmasking the monkey

I stare at the screen in front of me, at the attempts to catch the monkeys that have escaped from the laboratory. The videographer is filming a monkey standing at a doorstep and ringing the bell. He looks up to see the surveillance camera, jumps on the pole of the outside balcony of the house, and hits it with his palm until it comes off.
Before anyone opens the door, the monkey turns behind him to see the photographer, and walks towards him on all fours calmly and confidently. The photographer steps back, and suddenly the monkey attacks him, and the video ends.
It is said: This recording is part of a broadcast on Facebook. Its owner was injured after filming it and his phone was destroyed. What is strange is that its owner was not injured by bites or scratches from the monkey, but rather lost consciousness as a result of the monkey's attempt to hold his breath!
What do I see?! What experiments were conducted on these monkeys?! What experiments are being conducted on humans?!