When you choose to see the picture again for Lewis' alternate death, the swords are still in place. Clearly, they haven't cut through the support wire for the weights since they're still perfectly in place. For that reason, the weights couldn't have possibly crashed down to smash Lewis. Also, in the normal death, decoration swords shouldn't be able to cut the metallic wire that keeps the weights up. They're made of tough material to support the weight to begin with.