Dragon Shaman Vigor (PHB2-13) provided fast healing for allies within 30' of the character.
When does this healing take place?
On the shaman's turn or the ally's turn?
At the start of the turn, the end of the turn, or anytime desired? (eg, if movement happens, do you have to be within 30' at the start, end, all, or any part of the turn?
Edit: DMG-293 says fast healing happens at the start of the turn. And since other shaman powers happen on the ally's turn (eg, bonus damage), we'll play the ally's fast heal at the start of the ally's turn if they start their turn within 30' of the dragon shaman.