This door certainly isn't the CMs door. It's L2.
The LF is bloody lucky they where not flung out into a spinning engine. The doors open with quite some force. If you're not holding the inner handle when you lift the door handle, It could get messy.
JQ procedures are to open door from outside. An Airbus door will not deploy the slide while armed if opened from the outside.
The L2/R2 L3/R3 doors are not use on the 321, must have been a mega brain fart. Such things happen when you're dealing with people.