mik5
“You have to apply your mind to hear every word from the mouth of the baal korei, not just hear it “in the background” while deeply engrossed in your own thoughts. Otherwise, it’s no good.”
source?
Dozing off is obviously irrelevant since while asleep he doesnt hear (Arguably)
“On two occasions, I personally witnessed the grandson… “
Mazel tov, on more than two occasions I have seen Gedolim not resort to fire hazards and who kept the minhag of banging by haman alive I assure you they were yotzei too