This is stupid, the warlocks nova bomb acts the way it does on purpose. The golden gun is meant to be aimed as its own variation, as is the titan with his charge-in style fist of havoc. I can't tell you how many times I've missed with the nova bomb, so don't start on it bring un-dodgeable
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you're just bad then. Nova Bomb is totally unavoidable and uninterruptable, same as Fist of Havoc barring user error. Golden gun takes much more discipline to use since you only get 3 shots and unless you have insane twitch reflexes, you're likely to miss a shot or 2 in a heated engagement or at best if assaulted by a group maybe get 1 or 2 kills. Bomb and Fists are just fire & forget (Fist is even more ridiculous though since while you can't STOP the nova bomb, you can still get lucky and kill the warlock in retaliation - there's no killing a Titan.)