It used to be that if you were in a group with somebody, were within normal range (not greyed out in group overview) and that he dealt damage it counted as your damage for geting Kill credit and Loot rolls (in adition to giving it him).
This also relayed XP.
It also used to be that if somebody was affected by one of your hot's that damage he dealt was relayed to you - even without a group (this had the advantage of making looting as healer easy, but might result in you being in combat via the relay too).
I am not sure if this also relayed XP.
I read it multiple times (but cannot veryfy) that the group relay is currently offline. You have to manually deal damage to get loot and/or kill credit.
I noticed some time ago (I think before 1.1.5 patch, but not sure) that the damage relay on hot is offline too.
Both together make getting loot a healer a bit hard - you have to DPS to get your roll. It could be that the group relay went down some time earlier but was still covered by the HoT relay. Or the other way around (as healers in groups tend to heal, one way or the other the damage should be relayed).
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