I have a soft spot for those who level priests, paladins, shaman, or druids as a healing spec. If I had been in your shoes, I probably would've left one of my 5 behind for a few minutes to invite the holy priest and help them kill the mobs on that island. After all was said and done, it wouldn't have taken too much longer to do the quest over again for the 5th guy I had left behind.

I know it would've taken longer, but the "me first" attitude so many people have really gets old.