His goal was for these furs to be nearly irremovable, come Flowerbirth.
He doubled up on the amount of nails for the current fur than he did the first two. Satisfied with that, he moved backwards--with some grunts and huffs of easily detected frustration--to readjust and reset the first two furs he had attempted to hang. He repeated as he had done for the third, doubling up on the amount of nails than he had used before. Hoping this worked, he stepped back briefly to look at his work and formulate a plan for hanging in the corners. Gathering more nails, he would continue to work this way so long as the nails held.
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Noah doubled up on the amount of nails he originally used and tried to re-hang what fell.