The bowing horse's rider had a little riding crop and he would tap him on the left shoulder to cue him to do it. I'll bet he did it 7 or 8 times coz I got a picture of it 3 times.
It’s a fun trick to have taught him. I thought about teaching my pony to bow... worked on it for about an hour one afternoon....
The trouble with me is sticking with things :~)