No, no, no. Absolutely no, no matter what. Soldiers helping a wounded man pose absolutely no threat to anyone. A wounded man being carried away poses absolutely no threat to anyone. If all of the men involved are extremely lucky, the wounded soldier might, someday, with luck, be well enough to fight again. In several years. Not right now.
I would only shoot them if they fired first. Medics can't do that, and I'd count anyone helping a wounded man a medic.
EDIT: Oh, wow, you meant in a video game. If it's a video game, then I'd shoot them if they were taking the wounded character away to be healed up and after me again in ten seconds. I mean, I always aim for the TF2 medics, if that's what you mean.