just run away after u kill 1 ( about spell casting range) and watch afar...
if it reraise, it will just move away without agro.. if u r too close, it will auto agro u.
any of these can have reraise ability..
but they can only reraise once...
so if u kill the mob again after it reraise, it will just "finally" decompose.
only thing i cant confirm is weather ALL of them have "reraise", i suspect they do... just that if they dont reraise, mayb it had already die once b4...
so safest thing to do is to move away after u kill 1 n watch if they reraise again.