Until the next update goes live this fight is very much broken. My apologies!
I've identified what was causing this issue and it will be fixed in the next update. There is still a ghost in the machine in regards to reseting the minions and not the heart, or the heart and not the minions.
For the time being if you think a reset is spotty, or you get one minion that refuses to be targeted run really far out and allow all of the components of the fight to reset before engaging him again and it should rectify. This is a work-around until we can clean up how this process is being handled, but should allow you to enjoy the fight in the meantime (after the fix goes in of course. Until the fix avoid this fight as you will not be able to complete it in its current state).
Thank you all for your patience as we push past these bugs.
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