Witch Queen PC Help - Phantom Specters of the Hive

[JUANHDA CX]

How do I kill a hive wraith? He pressed the M key when he was close but the map Witch Queen PC Help - Phantom Specters of the Hive for me, I haven't played for a while and the game doesn't tell me anything, there's nothing in the controls either, searching I found that it's with M but trying doesn't do anything and I'm on a mission later where it's mandatory.