Another thing to clarify is whether or not the Hatzolah members are considered to have been transgressing anything if in their mind there was an emergency, even a ??? ???? ???. Is this different than performing a Bris on the wrong child, where you were doing a Mitzva — in your mind — and yet Rebbi Yehoshua says it is a ???? ????. Perhaps ????? ??? is different since the ???? applies even to ??? ????? ???, and so it shouldn’t be any less of a Safek just because there is someone who knows it is not needed.
But then, if this is so, this can ruin the ???? of calling in to cancel.