Sir Elza did? This can't be a coincidence.

[ hearing that actually helps convince him that it's not Fiona. As far as he knows, Elza and Fiona have never even met each other - she'd have no reason to message him, and, in fact, wouldn't even recognize his face. ]

There's something strange going on here. That wasn't Fiona. It was someone who only knew she was connected to us...