The door appeared to be an INTERIOR door, not designed for use as EXTERIOR door. Maybe the landlord cheaped-out on construction as interior doors cost way less than exterior doors.
Interior doors are very much like what you saw in the video: Usually just 2 layers (1 front and 1 back) of very thin luan plywood on a door frame and hollow inside.
They're often called "hollow-core doors" vs. "solid-core doors" used for external/outside wall doors. You aren't kicking through a solid-core door easily...the lock/door jamb would go first.
At least the "victims" let the guy come into the room and identified the target rather than just blindly shooting through the door (not a good idea even if you're SURE who is on the other side). Plus, with the assailant THAT close, he certainly was "a clear and present danger."
Good shoot.
Whatever, the landlord will have to replace the "cardboard" door NOW, won't he...
They just don't build doors like they used to. I had to use an axe. -- Jack Torrance