Big Asuras can't look up
It has to do with camera placement behind the character. The camera can’t be in the same position for both Norn and Asura because of the difference in size between the two races.
For the Asura, the camera is positioned much much closer to the ground, so when you look up the camera “hits” the ground much earlier than for the Norn. And when the camera hits the ground and you try to look further up, the camera starts moving towards the character.
The only solution to this is if the make it so when the camera hits the ground it changes pivot point from the character to the center of the camera so it stays in place and looks up from that position.
Bleep-Bloop