[ But he feels like he is onto something...he doesn't know where, though. But the glitter on her hands has been bothering him. ]
...Normally. Perhaps the killer pretended that they were suffering from the motive or otherwise and asked her to accompany them earlier. They then persuaded her into some type of activity with glitter.
I'd be more inclined to say they purposely covered her hands in glitter before they left, but if that were so, she would have more on her hands. So it's more likely she participated voluntarily.
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[ But he feels like he is onto something...he doesn't know where, though. But the glitter on her hands has been bothering him. ]
...Normally. Perhaps the killer pretended that they were suffering from the motive or otherwise and asked her to accompany them earlier. They then persuaded her into some type of activity with glitter.
I'd be more inclined to say they purposely covered her hands in glitter before they left, but if that were so, she would have more on her hands. So it's more likely she participated voluntarily.