I have been killed before while doing my super "Nova bomb" and I find that the amount of time spent in the air and the fact that warlocks aren't invincible like titans when they cast their "Fist of Havoc" means that if you can aim fast enough it's relatively easy to kill a warlock before they fully cast "Nova bomb".

Yes that's true I have tried to kill titans numerous times with heavy weapons and supers while they were casting their Fist of Havoc. I have yet to successfully kill one while doing so.