Sign post - memory moment

Im reading this book called Fountain of weird, and I found a memory moment. In the text it says, "I reminded him of the time we bought a book on witchcraft at the library book sale".This proves that this is a memory moment because he is reminding him of a time when they went to a library for a book sale. another piece of evidence says "But, but. . . Avery is my only child! Avery? That was the kid who traded the jar for Simon's wagon!". This shows that this is a memory moment because he is remembering that she was in his sight before.