He suppresses the first instinct to pull back and away at that confession, though his hands do tremble some regardless of the effort to not show how that simple set of statements has effectively turned his world upside down. Pulling away however would just undo the good he has managed to accomplish here in calming Belle down from her earlier distraught state.

"If you had no choice..." He can't help but wonder if those words are true or a justification of her actions. It could be possible she had been in danger and thus had used the dagger to summon him and protect her, or it could be something more unjustified...he couldn't really believe she'd maliciously use his dagger against him, but if he'd denied her something she wanted badly enough...was it possible she'd use it against him to get it?

"What happened, Belle? How...did you get my dagger?" He hated to ask, hated how his voice trembled as he asked that awkward question. He's staring beyond her towards the wall she'd appeared by, afraid for once of what might be seen in his eyes. His uncertainty and the quiet lurking fear that the answer won't be something he cares to hear.