Did you just completely ignore my actions? What the forget?
(Don't tell me about loving emps and hypnosis, if this is how it goes, then anyone will be able to stop any action from the boss anytime)
Firstly, your initial actions were overwritten by the morphine which triggered upon your health reaching 0, this is an automatic override because if i don't override, then you would just die and the fight would end here and now. (though given i could probably have it occur automatically after an attack)
Second, stuns or any variation thereof, such as EMPs or Hypnosis, do not last very long, and will not be capable of being used for stun-locks. Upon the end of such a debuff the target gains a temporarily, dispel immune buff. Which prevents them from being stunned in any given shape or form, this includes EMPs or Hypnosis, at the very least all it will do is prevent your allies from attacking just for that one cycle, this cycle the effects will be wearing off and they will gain their resistance buff to prevent stun-locks.
Thirdly, i can't expect to please everyone. But the game is still constantly in development, systems change here and there but there are some tweaks i can make to give the boss a more enjoyable experience, such as having effects like the morphine occur automatically after an attack, or allowing bosses to attack instead of death overriding them immediately, and instead killing them immediately after the attack.