Almost as soon as the contract started to burn it started repair itself. The reason? There were two contracts now, duplicates. But little had Inari known when she cast her spell that duplicating a blood contract didn't just make a real and a fake. No. The blood and magic of the contract was real. It instead simply extended the contract. As long as one existed, so did the other. They would both have to be burnt.
The attempted burn of the contract did do something however, as once it was set afire the magic signatures in the blood of this contract went out in like a beacon, and the signatures of the other contract responded, showering a number of thousands of weak magic signatures there in the room, and further in the castle, where the library lay.