After the paper bridge fell
Illustrative scenarioThe child's own words
My paper bridge fell. I folded the bottom thicker, and the eraser stayed up the second time.
Reflect and summarize
You kept an important difference between the two tries: a thicker fold underneath, and a different result. Putting the attempts side by side makes your discovery clearer.
Notice the child's stated action and result. One attempt does not prove there was only one cause.