It seems to me that the attack on the fellowship was fairly well planned (in the books). They had orcs, trolls... The fire in the main hall must have taken some planning. To muster that many orcs in one place must have taken a bit of time. I don't think that the stone could have caused the attack. They must have already been prepared when pippin dropped the stone. The stone micht have been a final signal to where the fellowships exact location was, but that is all.
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