How the hell does it take 4 minutes to evacuate a commuter turboprop, on the ground, in almost-perfect conditions?
KRviator.
I suspect due to the distance from the R1 door sill to the ground, each passenger had to sit down on the sill and lower themselves to the ground. I doubt there was a jumping castle in position to catch them.
If there was fire licking at their heels, I'm sure they would have jumped faster!