FD before mob dies

[scifo76]

To avoid getting faction hits, I have sometimes used the trick of feigning death just before the mob dies to let my DoTs and/or pet do the last dmg. It has always worked. I get XP, eventual loot but no faction hits.

Yesterday, I started camping the geonids in WL, and when I did this, I did NOT get any XP and the geonid's corpse poofed. It was as if an NPC had killed it, but no one else was around. I only got the message that "You have slained a geonid", but nothing else.

Are the game mechanics different in WL or what?