Bug
there is a bug where the nexus turrets sound like they are going off when there is nothing to target. often happens after the turret kills a creep but the sound does not go away
1 Comments
I saw a turret target and fire at a dead creep for 2-3 seconds in ARAM. I don't remember if it was specifically a nexus turret. It was very similar to what you describe. ( I think one or two shot animations didn't show, but the sound played.)