Not sure if this is the right section or the Bug Reports... but.
Armadon's quills don't do any damage on first use. Second time the enemy gets hit by quills, it does though. I'm not sure if this is intended, it doesn't make sense if it is intended.
Match ID: 10590183
An example of what I mean is at about 8:55 up top. My first quills don't damage anything, then the second lot do.