Negative, commander. You can't dodge these attacks in Haukke HM. All you can do, is stun them/silence them in order to build your LB and ONLY before she eats the first add. Then you can't stun/silence her anymore. But yeah, you can dodge almost every cast/magic attack by going to the enemy's back.
Intopic: I don't see how is that a exploit. Is a different tactic and you can mess it up as well. It requires timing. it's like stacking giants in T7. You stack 4 giants and they don't spawn anymore. Or you can kill one giant and petrify the other one. Tactics are tactics. If they work for you, so be it.