You have

"I will join you." you said with contentment.

...

You watch as Stannis Baratheon men left him on the battlefield. The brotherhood without banners stay back letting Stannis army get crush by the Boltons. Anger begin to boil into your chest as you watch the battle slowly coming to a end.

You saw Stannis and his last remaining men backing into the forest as they try to fight off the Boltons men. You walk up to Beric asking him a question.

"Why aren't you helping him and his army? He the last Baratheon alive and you'll just let him die. I thought you had honor like Eddard Stark but I guess not."

Beric shook his head at you and walk away to his tent. You realizing no one was going to help Stannis men, ran to get a horse.