MoP, Can healers kill?

I'm a veteran WotLK player and just tried MoP recently.

I notice the difference when playing healer, MoP healers are very difficult to bring down but they can't do any damage to anyone, compared to WotLK.
I love playing healers in WotLK mainly because I can 1v1 duel with any classes that I can kill other classes or be killed by other classes.

Is it just me? Can MoP healers 1v1 duel with other classes and will not end up in an infinite battle, can't kill anyone and can't be killed by anyone?