It's Q&A time over on the Camelot Herald, here is one of this weeks questions, to read more just follow this link:

Q. <Insert clarification/question/argument regarding Dragon attacks and player attacks mentioned in the previous two Grab Bags here>

A. Guys. Seriously. Nothing you do to the dragon will cause him to generate certain attacks. The attacks are verifiably, certifiably, completely random. I did receive one argument regarding procs causing sharks to add in ML 1.8. Here’s what the Lord of the Flies says to that: The sharks are responding to the damage type (which makes sense because the bleed effect puts blood in the shark-infested waters), but not to a proc. We currently don't have the functionality for monsters to react to a proc in and of itself, and we didn't hook up any damage-type triggers on the dragon encounters.