The same adult who used your prototype at 10:30 is back.
They know what it looked like before. They are going to notice what changed and what didn't.
Your only job right now is to listen.
This 15 minutes is where your pitch story gets written. The gap between what they said at 10:30 and what they say right now is your evidence of design progress.
Each adult gives exactly three pieces of feedback. one of each type. Do not ask for more. Do not defend anything. Do not explain what you meant to do.
Just listen and write it down.