I seem to be encountering a strange kind of freeze where the game takes control away from me, as if some scripted event is happening, but nothing ever happens. This is when I'm trying to throw the bridle on the white wind horse. The first time it happened I was lucky enough to be eaten by the other thing flying around there, but it seems to keep happening so I can't progress :( Anyone encountered this before?

I ran into this issue as well. First it kept throwing the bridle off the cliff when I clicked the horse then I'd get eaten by the grey ghost.

I was able to get past it by leaving after I clicked the horse the first time, coming back, then the grey ghost was on a different cycle than the horse, so it worked first time.

I find it's easier to "hit" the wind with the bridle if you move to a spot behind the cave, underneath the ambrosia.
When you click the wind with the bridle then, it will turn around and lie down next to you, triggering the "cutscene" of fastening the bridle.