Vaal (map) keeps spawning minions forever

If you have a fast aoe skill that can damage both "Vaal Shadow" and the minions he summons in the "Maze" map and kill all of the summoned minions before he finishes his last summon-animation, then he starts summoning new minions all over again. This process repeats forever.

I currently use this to make sure that the boss is only busy spawning minions and can't use any damaging abilities on me at all. Extremely safe way to run this boss.

Bug or intended?

If it is a bug, it's not one they don't particularly mind, since it's been in the game forever. It probably was not explicitly intended and is just a side effect of Vaal's AI, but is deemed okay to 'abuse'.

Great, so we can just use this then.