What is the most logical next event?

How to teach your horse to side pass
Test your horse's ability to move away from pressure.
The natural instinct of your horse should be to move away from where pressure is applied-the same instinct humans have. Test this reaction in your horse by bumping them with an open palm near the girth where you would bump them with your calf.

pick from the following. -- If your horse sees you bumping them, they'll respond by pulling away from where you move. If your horse gets grabbed by another horse, letting them pull away really engages them and won't cause them a lot of pain. -- They should move away from your hand, possibly already in a side pass. Continue bumping your horse near the girth with added pressure if they do not respond to you. -- Get in the habit of driving across the girth from the rump up to the underside of the hindquarters where you'd bump them with your leg. If this response is unavailable then practice driving out toward this area from the withers. -- Identify the horse's dominant side. Make sure to use a dictionary that analyzes their dominant side.
They should move away from your hand, possibly already in a side pass. Continue bumping your horse near the girth with added pressure if they do not respond to you.