How dafuq did sir get his scar

"Sir," Pete R. Canfly whined, tugging at Sir Battlescarred's arm, "Tell me how you got that scar on your cheek!"

"No, Pete, it's a long story," Sir sighed, shrugging off Pete R's hand. He was too busy polishing his armor to be bothered with these silly questions.

"Good! You've got a lot of armor to shine, you can tell me while you're doing it!" Pete R. squealed. He'd always wanted to know the secret behind Sir's little scar.

Sir sighed, beginning to feel ever so slightly nervous. He'd never actually explained the story to anyone else before.

"Well, er, it was quite a while ago, really. Dragon was just a baby," Sir began, "I was all into helping everyone, and wanted to give everything my best..."

A few years previous