"Further conversions" quest bugged

[sone3d]

Location: Isle of Quel'Danas
Quest: Further conversions

Everytime I kill a "Erratic sentry" it disappears so I can´t use "Attuned Crystal Cores" on it to get the objetives done.

Sorry my english.

[Slys]

Aggro the mobs with melee hit, that way it should work.

[Ricekrispies]

Location: Isle of Quel'Danas
Quest: Further conversions

Everytime I kill a "Erratic sentry" it disappears so I can´t use "Attuned Crystal Cores" on it to get the objetives done.

Sorry my english.

You must kill it where it is standing, or very close to that point. That way it won't disappear.