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I've had this ageswap story in my head where as a kid Reigen jumps in the middle of the street to save a dog and he meets Mob when Mob shows up to save Reigen (and the doggo) from oncoming traffic. So Reigen stalks Mob to the office and he's genuinely a good kid because little Reigen thinks it's the coolest thing to help people with your powers and Mob acknowledges this and agrees to take him on as his student
Slow Horses, S02E02 - From Upshott with Love