Using medusa against the Warlock boss in the cavalier monthly EQ threw me for a surprise when 6 armour breaks from the mlm+sp1 combination did not convert into an armour shatter. It showed 5 armour breaks at the end of the animation which somehow became 6 and then dropped to 4.
This happened twice in the fight. The sp3 armour shatter did get applied consistently.
Here's a video of the interaction (happens at around the 14-17 second mark):
https://youtu.be/u7WyHL7qSNcI don't know whether its a bug or an interaction because I've used Medusa against warlock countless times and this has never happened.
Thought I'd post it here for analysis.