This idea may be a bit of a stretch, but I personally feel as if it could work. Seeing as the Captains are almost borderline heroes, but not quite, and they are important for the ramparts in Breach, sometimes they have very low health but never recover it. A workaround for this is killing your Captain so that he respawns with full health, but that can take a while and honestly isn't really the best thing to do. A fix would be to just allow the Captain to regenerate health when out of combat, just like the 'Regenerate' feat, which would be good, but then that could be a bit troublesome in the long run. A more fair option would be being able to revive the Captain to half health within a short window where he will automatically respawn to full health like he currently always does, but this can give those who are outnumbered an extra ally who could aid the allied player, or at least distract the opponents trying to gain control of the rampart, without being too unfair of an advantage.