High vertical ascent/descent is very, very dangerous[1] method of takeoff/landing for helicopters, so especially in case of medical transport I would expect it to be due to safety factors more than anything.
[1] been decades since I've read the textbook on it, but IIRC it involves higher load on rotor and engines than "running" methods that utilize ground effect and provide horizontal momentum against wind gusts.
I have the same recollection which I think is why it stood out to me the first time I saw it. It's frankly kind of bizarre looking, like it's getting hoisted by a crane.
[1] been decades since I've read the textbook on it, but IIRC it involves higher load on rotor and engines than "running" methods that utilize ground effect and provide horizontal momentum against wind gusts.