Kira's mother knew the Nogitsune was coming and she's issued it a warning. Does the warning allow for Stiles to remain safe, or will it mean destroying both?
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Scott let the Nogitsune inside through his open door and now they are one. Darks Stiles is badass.
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Scott and Derek witness a wire breaking. Was this something dark Stiles did or did the Nogitsune do it for him? We don't know.
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The Nogitsune wants to know -- What does everyone have but no one can lose? Their shadow. Stiles will not get rid of the Nogitsune very easily.
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Stiles starts to freak out a little bit during the MRI. Who wouldn't, knowing their entire future could hang in the balance?
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Melissa and Stilinski look over the test results. The news is not good.
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Scott gives Stiles a warm embrace before he undergoes tests to determine if he is suffering the same condition that killed Stiles' mother.
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Kira tells Derek what happened at the power station. They find Stiles' baseball bat there -- magnetized and stuck to the station. Hmmm...
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Teen Wolf Season 3 Episode 18 Quotes

Aiden: I kinda overheard... well I listened in on Stiles talkin' to Scott about how he thinks he was the one that wrote that message to kill Kira.
Derek: You think Stiles, skinny defenseless Stiles, is the Nogitsune, a powerful, dark spirit.

Scott: Stiles, why are you whispering?
Stiles: Because I think there's someone in here with me.