After Jon and his fused sister had finished having sex, Jon decided to erase her mind and turn her into his sex slave. But before he could, she pushed him off of her and ran out of the bedroom. Her brother had just raped her and she didn't know what to do about it, so she just ran.
Jon, furious that his fused sister had gotten away, chased after her. In his haste, however, he left the stone in his bedroom.
