You must mean: for some reason that didn’t look accidental at all.
A Death Eater sent to gather Harry’s blood would work quite well, since it fits in and supports quite well any model of reality in which the prison break involved Voldemort and not Harry (the two options being complementary in Dumbledore’s thinking).
But if an unrelated accident were to happen, all of the Order of the Phoenix would ask themselves “how high are the chances that Harry randomly ends up incapacitated during the exact evening in which he is to be put to a critical test of good behaviour?”, answer “pretty damn low” and treat it as a 95% chance of guilt.
You must mean: for some reason that didn’t look accidental at all.
A Death Eater sent to gather Harry’s blood would work quite well, since it fits in and supports quite well any model of reality in which the prison break involved Voldemort and not Harry (the two options being complementary in Dumbledore’s thinking).
But if an unrelated accident were to happen, all of the Order of the Phoenix would ask themselves “how high are the chances that Harry randomly ends up incapacitated during the exact evening in which he is to be put to a critical test of good behaviour?”, answer “pretty damn low” and treat it as a 95% chance of guilt.