Am I correct in presuming you presented them to her in that order? He sniffs as though he's smelt something foul, holding his head high... even though he doesn't have a nasal cavity. "Ah. 'Loaf' is in the air," laments Gaster, switching briefly to the-- intelligible-- spoken word entirely for the delivery of the pun alone.

Signing wouldn't have had the same effect, after all, not with an aural pun.