Board Thread:Speculation House/@comment-10390252-20130728185452/@comment-10390252-20140109131521

Based on the above:

I can see a fight between a Ruby who is clued in about Penny's real nature and Penny getting ugly. Ruby tries to disable Penny without destroying her by cutting off her arms (cue horrified gasps from the audiene when they see machinery instead of meat inside). Penny just keeps coming with lethal force until Ruby simply blows a hole through her chest with Crescent Rose, destroying her main power supply and the control apperatus for her weapons.

As Penny's systems fail, she has enough time to smile at Ruby and say "Thank you for a stimulating challenge, my friend."

Penny's guardian is indifferent and makes a comment to Ruby about trying again but doing a better job of it this time before off-handedly congratulating her. Ruby explodes in fury and is about to do something rash to him when Roman and his boys make their appearance.

This would lead into my earlier idea of Ruby stealing Penny's wreckage and rebuilding so she can learn to be human and a friend without her guardian's priorities distorting her decision-making.