I Spooked and Bombay Didn't

I took Bombay out alone on a trail ride today.  I hadn't ridden him in a while, because either someone keeps biting him, or he's found some sharp spot along the fence or railings to scratch himself on and every time that I see him he has another chunk taken out of his fur and/or skin.  I don't like putting a saddle pad over open sores and cuts.

Bombay has been behaving in a grumpy manner,