I haven't encountered this situation while healing.... I have, however, been on the other side of the situation. Took my arcanist lala into Sastasha once a while ago and the conj healer was always waiting till the tank was 50% and below. Or wandering off... - so I became healer for a short duration. >_> I couldn't trust the healer when they were constantly making me nervous about the tank's health. "You don't trust me". no - no I don't.

In your case, they seemed to have been over reacting or just not paying attention to the health bounce (from faerie/physicks)