She's threatening, no question about it. But threatening who, and with what, isn't clear.
I believe that's just her "style". When she gets a question she doesn't like, she goes into a defensive shell and utters vague threats.
Think playground: she's of the "I'm gonna get you!" school. Lotta hate in that woman. They're both psychopaths...
Y'know, she's giving us two choices here. And only two choices. Either a.) she knows exactly how it happened because she was there or b.) she's taking Bill's word for it.
And, if pressed, I don't think she'd want to admit to either...
Oh, to be asking the questions:
Q. But how do you know that for sure, Senator Clinton? Were you there with your husband? Or are you taking his word for it?