Repair Blast is Doc's secondary special ability in Minion Warfare. Doc fires a blast of energy that can infect a teammate. Any teammate infected with the Repair Blast will slowly regain health for 10 seconds at a rate of 3 health points per second. This requires no extra input from Doc, allowing him to perform other actions.
As a secondary feature, any infected teammate will have a healing aura around them for the duration of the effect. This allows them to inadvertently heal other teammates that stand near them. They will be healed at the same rate as the infected teammate as long as they stand near them.
"Infect teammates with a nanobot serum that heals them over time. Not only that, they can heal other friends by proximity!"