On the train, Madeleine tells Bond how her father taught her about guns and prepared her to kill. She said he kept the gun hidden under the sink beside the bleech. I know it's only a small thing, but this is one of my favourite moments in the entire franchise.The juxtoposition of the mundane and the murderous makes it a truly compelling image.
Given her efficiency with guns, and though Hinx is dispatched rather neatly with those barrells, I half-wish they had let Madeleine kill him with the gun. It would have been a change for the girl to do it instead of Bond and also quite ironic given how he had gone through most brutal fight in the whole series.