The black gelding does not act like it is trained otherwise asking for a trot would not be an issue, you can tell he does not know what she wants him to do and it look as if she really does not know how to ask him if he did.
He is just kinda meandering in the video not his fault he just don't know what to do. IMO
He is just kinda meandering in the video not his fault he just don't know what to do. IMO