"I mean... I have to try this on myself." You say, "It seems so obvious now that I've seen it work."
You take the sword and also cut yourself at the waist. You hadn't thought of where your upper body was going to land and fell backwards onto your back as your top half slid off.
"Oof..." You groan.
You sit up onto your waist stump and take a tentative step forward with your unattached legs. It felt strange but you could move, it was easier to move while you could see it. That might explain why the brunette's lower half couldn't manage to do much but thrash around - she couldn't really walk around without seeing where she was going.
It was interesting to move your legs through the house, you apparently had a good memory for where everything was. You could even feel a vague direction of where your legs were, some kind of proprioception at a distance. You tried to walk your legs back through the living room when you bumped into the brunette's now standing legs. She kicks wildly and falls over.
"Aw, geeze, sorry lady... I don't know why you left something so important if you didn't want people to even brush up against it." You said.
You kept walking your legs back to you to rejoin them to you when you had an idea... Why not attach the brunette's legs to your upper half? Then she'd stop kicking around and freaking out in general, or at least her lower half would. You wondered what would happen to your old legs... would you keep controlling them at the same time too? You boggled at the possibilities.