Congratulations on a great hunt! I think you made the right decision to not shoot the black one- but maybe for a different reason.
I have hunted with a couple of experienced Trad hunters who tried to shoot bear while they were laying down. In both cases they hit the shoulder and the arrow failed to penetrate into the vitals. Something about the way the shoulder slides back when they lay down.
A fee years ago I had the opportunity to shoot a big bear while he was laying down. I decided to wait and was rewarded with a nice standing broadside shot.