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I think the "while the ambulances sang, another boy without a sharper knife-" is a reference to trying to kill yourself, by cutting your wrist with a knife, but failed---because the knife didn't cut deep enough.
I think the "while the ambulances sang, another boy without a sharper knife-" is a reference to trying to kill yourself, by cutting your wrist with a knife, but failed---because the knife didn't cut deep enough.