you are in a tight spot, called for backup. you run out of bullets and got shot in the shoulder, lay behind a wall for cover and hope the backup come soon. you saw someone familiar tenting to your wound, you saw your backup is there.

"you came.." you say, looking at Roach.

"you called." Roach replys as he tent to the wound

the other members of the backup group pushing back the enemies and killing them while Roach stays with you. He always came to you like you have the power over him.