((I decided to make the attack as if you were holding the sword one-handed, if you would rather have it be two-handed, then specify it in your action, as I was unsure.))
((You did perfect! I will be less subtle, but I had said, 'sword in one hand' and thought that enough, and you caught it, thank you so much!! But ... no Duh! I can indeed be more direct!
))
The song continues, loud and boisterous!
"I find it very, very easy to land hits
I chop this robot into tiny sparking bits.
My sword shall plunge, enter and entwine
Your head is mine, evisceration time!"
I am already perfectly positioned on its back for this, so I lean forward to drive the sword into the opened chest cavity, through its center and down into what would be a human's abdomen. I'll twist the sword and assist its wriggles, no Duh! but I'm not pulling the blade out again until I think I need to, or until the robot is clearly destroyed, simply yank and saw and push/pull/push, chopping it up inside its chest cavity... solid... whatever this particular variant of metallic ruin had before I perforated it.
I'm open to putting my other hand on the sword's hilt to assist with this sawing, mangling motion, but I'll also try to keep an eye around.
No Duh! but I want to know where that head rolled off to. It's mine now, and when I'm done here, I go get it, trophy time!
It's an afterthought, but I pause the song after this stanza to shout,
"If we're not done, take its right knee, maybe aim between wires two and three!
'twil be a shot felt 'round the robot', I am sure of this!"