<Trooper> takes a dead soldier to the reserves and heals them.
Ally dead body on battlefield (once).
"I saw a tunnel, with a light at the end, and... - Yeah whatever, you've been saved now. Get back in the game!"
Saviour is a high-tier Doctor-exclusive unlockable Ability. With it, a Trooper can revive his dead teammate (including enemy troopers who have been turned by Propaganda), which is accomplished by the trooper taking the body off the screen and going back to fight. Revived troopers will join the next wave of reinforcements, fully resupplied with no Deployment cost, on top the usual number of troops.
A single doctor can only use this skill once per battle, unless there are instances of other doctors using Saviour on him or the doctor receives the Retreat command. Should the latter come to pass, the saviour counter status is reset, allowing for one more usage in next deploy.