On the unfortunate end, it's definitely something inching into fear when Dio confirms it- a moment that is brief, and fleeting however, when he continues.

The words do not quite compute, to put it gently. "...I..." Not...

"You're not..." He's lost for words. Incredibly lost for words, in fact, and it's struck him entirely dumb. He stands there, his jaw opened as the words fail to really come to mind, the confusion written across his face.

Finally he latches onto the only thing that makes sense, looking away. "I don't... ...It's not you I recognize, just your name. I..."

He shakes his head. "...maybe it's coincidence..." Surely, the person who led Pucci to such ends wouldn't have such a pointed lack of interest after all.