There's another pause - though this one is, at least, way smaller - as Illya tries to process all of that. This is a little less confusing though. Maybe it's just since she's starting to get used to the way the other is speaking, so her mind can filter out the important information a little better when she knows which parts to ignore..

Which is why the young girl furiously shakes her head once the other arrives at the end there.

"No way! I'm going to do this for you!" She already made up her mind before, but.. now she definitely wants to win one of these goldfish.

After all, it seems like Miruca really wants one. And that sort of thing only makes Illya more determined, especially since.. yes, the other is right, it's not like a goldfish is really going to attack her here. Even Illya can see that.

"I won't rest until you can take home a goldfish for your table, okay? S-So.. please count on me!"

.. maybe the cheer did, indirectly, work after all. Because the look Illya gives the other is certainly more determined than a few moments ago.

Funny how these things work sometimes.