Bloody Imp-ossible!

http://www.wowhead.com/?quest=10924

Item [item=31813]Warp Chaser Blood[/item] does not drop from NPC http://www.wowhead.com/?npc=18884 with or without
Crystal [item=31815]Zeppit's Crystal[/item] being used. Imp from Crystal does not collect blood from warp chaser corpses either regardless of distance from corpse on death, time of summoning, or amount of time the imp hangs around the corpse after its dead.