from a very young age, before Deimos went rogue and turned on all his friends, he was a good guy and was a counter-terrorist operator for rainbow. And he adopted you when you were a baby after a raid where your dad was killed by him in a firefight between rainbow and him for planning to attack a public mall using chemical warfare and toxic gas. He knew you would never find a good home in foster care and he never had any kids so he adopted you. Of course he eventually turned bad and stabbed his friends and rainbow in the back. This happened when you were still really young and impressionable and decided to mold you to be the perfect soldier and trained you hard every day for years to become a killing machine

“Come on son, you’re better than this.”

he judges you from behind while you were shooting some moving targets in a range and missed a simple shot

“Let me see that. I bet you didn’t even zero it in correctly…”

he snatched the gun from you and properly adjusted the scope and handed it back to you

“Try not to disappoint me this time.”

he took a step back and looked at you through the masks eye lenses