Yes, both meant Tri-Disaster, sorry for not using the same abbreviation twice. Also, for your other question, Dreadwyrm Trance isn't on the global cooldown, so I'm assuming you're accidentally clipping the animation and not buffering the inputs correctly.
If you DO start DWT and put the ability in cooldown but don't get the buff.... that might be a very bad bug, but it's never happened to me.