Question for Shamans

[Tenloar]

Hello all.

I have a quick question in regards to Shamans in group. (Keep in mind this is pre-60, so no Torpor!)

I recently grouped with a Shaman that casted Canni quite frequently, his health would get down to the 30% range while fighting mobs. He would get agro and I would toss him a heal before he would die.

Question being:

Are Shaman's supposed to self heal through Canni's or are the Cleric's supposed to be keeping them healed through it? Whats the procedure or intended notion as how to proceed?