Because the rear door wouldn't open fully, removing it required some cutting and hammering. After the doors, the next things to be taken off were the sill trim, rubbers, and flares. After that, the damaged rocker panel is pulled out and cut away from the body.
We're amused by Arthur's technique, as this premium SUV is treated to some old-fashioned blankets and used bed sheets. Cutting straight through the B-pillar to fix a dent doesn't seem like a reliable way to fix a car. Maybe another doner panel would have been better for the structural integrity of the Q5.
Maybe it wasn't in the budget. Sure, the wreck was probably bought at a fraction of the original price. But it's a used car, and the guy who bought it is probably looking for a quick and profitable flit. If you're buying an American import anywhere in Europe, make sure to do your homework.
Even so, you can't even tell it's been in a crash. And instead of filler, the welds are covered with old-fashioned led. So paint thickness scanners might not pick anything up. Watching perfectly straight doors is a little more soothing for the automotive soul, though.