Siaga is now responding to the bit very well, in terms of direction (combined with leg aid) and woah and back up. We had a nice ride today down the road, and even dismounted to end our ride on the road rather than in the yard, because he kept trying to go in the yard, so I let him go in the yard and then worked him there, rode out on the road, stopped him, dismounted.
We did have a few spooks, including a couple barking dogs and one snarling, slinking dog. ._.
Anyways, it went very well and Siaga is fast becoming a very nice, relatively dependable trail horse.