I don't know if you can get a better view in the vid. What exactly happened? I thought perhaps it was just a metal pole slung in from outside but that wouldn't account for the sheet in front of the guy pushing back into his face/front. I'm so confused!
Doors are designed to fold up in a fire or if you get trapped. Maybe wind, or person going wrong way, or building pressure change...anyway the trigger to collapse them was set too low and/or the electro-lock mechanism wasn't set.