Yesterday I was farming Rotscale with a group of people, and an argument surfaced.
I was using fire storm on Rotscale because I think that with Winter up, Fire Storm would interrupt Rotscale every second for 10 second (if he's casting, of course), where as Meteor Shower would only interrupt Rotscale every 3 secons for 9 seconds. Damage-wise, at rank 15, in my case, fire storm does 14dmg/second for 10 second, for a total of 140dmg, where as Meteor Shower does 56dmg/3 sec for 9 sec, for a totaly of 168dmg. The difference in dmg is easily covered with a flare. Not to mention Meteor Shower takes 60 sec to recharge and 25 energy to cast, whereas Fire Storm takes 30 sec to recharge and 15 energy to cast.
I only use meteor shower to take out bowman and rotting dragons. And maybe on Rotscale when I have plenty of energy.
Please let me know if my reasoning is correct. Thanks!
A

, and interrupts.