IT's a hilarious bug if it is one, but just after you take the mermaid for the hot air balloon ride and he's dropped off at the Isle of the Sacred Mountian, Graham's animations go weird and he's standing on the water, and when he moves, he's swimming in the air. Not sure if this is brought up before, or what. http://www.youtube.com/user/drubell06?blend=21&ob=5#p/u/5/Qbrf2p_EGrA
go to 6:20
I'm not sure if it's my graphic card or a bug?
Yeah this is kind of a weird one - we saw it early on in testing and had it totally fixed at one point so it's a bit odd that it started happening again. Not anything particularly serious as he'll switch back to walking if you leave the scene and come back or go farther into the water and back out. It's actually kinda funny to watch him "swim" up the stairs.
I experienced the same thing, as have Toegoff and Drubell06, according to their Let's Plays. Interestingly, if you look at Drubell's video, you see duplicate Grahams (one in the water, one on the boat).
Toegoff:
http://www.youtube.com/watch?v=E_tWZsqrwtE
(6:30)
Drubell06:
http://www.youtube.com/watch?v=Qbrf2p_EGrA
(6:00 - end)
http://www.youtube.com/watch?v=hnKO1z7sdk4
(1:17)