You chose to go left--You travel on in silence, leading your lame horse.

You did not chose to go right--Nothing changes.

You horse balks after awhile, too lame to keep walking. You try to make your horse move, but it won't, and you're forced to carry on by yourself. After walking for a long time, you realize you left all your provisions in the saddle bags back with the horse who is now lost in the wilderness. You soon die of dehydration afterwords. Sucks.