An NPC merchant (I think, it was the female Charr one) started to resurrect a dead enemy PC in the bay. But as our side took over the bay, the now friendly, green NPC merchant continued to revive mentioned PC and there was no way to stop him (using a CC effect for instance), since the merchant was an ally. So in the end, an enemy got resurrect by our own NPC.
Maybe it’s time for you, to remove the whole revived-by-NPC thing in the WvW completely, since I consider it as a PvE feature we don’t really need in the WvW.