hum...dumbledore changed so abruptly because of his sister death,and to add with he believed he had killed her:he felt remorses until the end of his life(book 6 the cave)
ron had already seen harry say "open" in sparseltong 3 times(2 in book 2 , 1 in 6th).so it's not completely stupid to think he couldn't imit a word(the whole thing is whether or not y can learn to speak sparseltong)
as to the tape recorder...Didn't you read HOGWARD,A HISTORY??!tape recorder don't work because there is too much magic around hogward.
(it's a joke)
but part of it in think like y(and we are not alone)the end deceived me(the diadem, the epilogue dumbledore responsibility on snape's death, and the lack of deathin the main char)
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