flying changes - help!
I have a question, more about a different way of training a horse to do a flying change or asking for it than I am familiar with. For a little background - I have been doing changes for years, on multiple horses, including teaching them successfully to youngsters from the base up. Every trainer I have had up to this point asks for it the same way. If changing from left to right, get the horse going with forward impulsion, body completely straight, get them off of my right leg with a slight leg yield left, then take that right leg off and push them back over with my left leg to get them onto the right lead. This way has always worked for me, and makes perfect sense.
Here's the question. I moved and started working with a new trainer to get my H/J riding skills down much more solidly. The work over fences has been going great on his horses, but the lead changes not so much. He's explained his method to me multiple times, and I can get one of the horses to change, but not the others. I think I am still not understanding it correctly, and was wondering if anybody here had any insight into this way. If going from left to right, he wants the body straight, impulsion, just like before. But to ask for the change, he uses his right leg only, to push them onto the left front leg and free them up to change. You never use your left leg to push them over. How this works just isn't making sense, and I'm just not getting the majority of the horses to change this way (ones trained to do it with this cue).
Has anybody else changed leads this way, and if so, do you have any other ways to explain it to me. Thanks for the help!