Either meleeing or via repost. they didnt used to do any damage ever. not desired in some situations..
https://en.wikipedia.org/wiki/Combat_medic#Geneva_convention_protection In modern times, most combat medics carry a personal weapon, to be used to protect themselves and the wounded or sick in their care.[3] When and if they use their arms offensively, they then sacrifice their protection under the Geneva Conventions. These medics are specifically trained.
Hmm.. the old 'master level' cleric mercs would DPS when not healing. I wonder if they are using that code somehow.
I just returned to the game after a short layoff, and did my first mob hunting tonight. After 13 short fights, I ran a parse, and saw no damage from the healer merc. Tat