It's not very scary to freak out the sand people.
The way that scene is cut together, it always looked to me like Obi-Wan makes the call, the Sand People look up, see him and then run. If it was just Krayt Dragons that they're afraid of, they would have stopped when they saw it was just some old geezer in a hoody
Could this be a bit of a chinese whisper? What's the original source for identifying Obi-Wan's call as being that of a Krayt Dragon?
DE