ok, where in the movies does Liu ever do the high pitch grunt?

Lmao, no where I think. He yells when he blasts Shang Tsung over the edge at the end, um, and he does an exagerrated yell and then into a slight "disgusted" sound when he flattens Reptile. Oh, and he generally keeps quiet in Annihilation. I keep trying to relate with the noise, but a "grunt"... No, not Liu Kang. Maybe when he gets the shit beaten out of him, sure, everybody grunts and moans... Sorry, can't find you here.

i meant like his fightin scream where he goes wata!!!!!!