I watched Carole Mercer driving her lovely Morgan while riding another horse side saddle. Inspired, Anne and I went out and refreshed Mystic on driving, then hopped on Tori and tried it out.
It is harder than it looks! To begin with, Tori was not thrilled having her head between the two reins running to Mystic. She kept trying to duck under one or the other. Then you have to keep straight which reins you are using to talk to Mystic and which ones talk to Tori. Both horses were very cooperative and we had fun.