I'm wondering if this parachuting story has got any corroboration. I searched in German but found nothing. It's a good tale, the stuff of legends, but for all we know he just hid behind a curtain in one of those 1000 rooms until after closing time.
The landing on the rooftop with a parachute and almost falling off - if it weren't for his lucky last second grab, is pretty intense. I wondered the same thing - why not just hide behind a curtain?
Well, you obviously need to search in Austrian ;)
Austrian and German are like Canadian English and American English.
I wondered about that myself, however, it is plausible in a sense.