I suppose that we can make more sense out of this then what's in the papers.
I would have thought that the jump out the wing exit door would have ben about a foot or so to the wing and then a slide off the wing trailing edge to just a couple of feet hang time in the air.. nevertheless evacuations almost always result in injuries.
Of course I don't even want to go there about the need for evacuations, but seeing as the alarm started in the cabin I wouldn't be surprised that it was the passengers who decided on what course of action to take.
Perhaps someone on PPRune can post a schematic of the published overwing exit process on this type arcraft