Foccus target the cyclope, do dodge stuff even when you don't target it.
Trisaster the 1st adds wave, you got more than enough time to cast it without swiftcast before they run for you.
Keep attacking the cyclope.
2nd waves spawns, bring them to the 1st wave, aerial blast.
Done.

Yup, I gave an use to the worst spell in the game. xD