I found it difficult to watch because there happened to be a party going on in the room. But it's my bloody apartment too!
Anyway for a while it seemed like his own skin was taking on the properties of that of a fly's, as is seemed to be separating into discrete sections destined to become the exoskeleton (also the sticky pads for wall and ceiled crawling). But then it seemed to be more along the lines of his human endoskeleton becoming the fly's exoskeleton, and much of the outer flesh dropped off as his limbs began flexing and unfolding in new ways, immediately after his jaw was pushed off. Shedding the face was probably the most gruesome part.
Fortunately it didn't try to appropriate all homologous features the way they are in a fly. Its a matter of embryology, but we might have see him turn inside-out and upside-down.
__________________
| (• ◡•)| (❍ᴥ❍ʋ)
|