That's definitely an "Oops!!" for Hermione. One of those life changing comments you don't realize will have that effect at the time. Mind you, if she'd known his state of mind, she -might- not have done it, but that's over and done with and she'll have to live (as long as she can with such a -strong- endorsement) with the rather catestrophic results.
My complimnets on a most original AU.