Personally, I have more respect for this species of fish than to resort to throwing rocks at them (or in a pool, run, etc. in which they are holding) in some lame attempt to create a condition in which they might potentially go on the bite.
I'll take a picture if I land one and I don't need to make them move into the picture until then. I think part of the secret is the step ladder to get a better shot with out the refraction of the light. I don't plan to carry the step ladder so I don't need the rocks. I don't need to uphold my reputation as a fisherman anyway. How many takes of one fish do you need anyway? He should have hired a stand in that didn't object to rock throwing, or that was better trained to follow the script. I fish for fun not for publicity anyway.