Nicholas takes this as confirmation that the pie is what it's supposed to be. Thank goodness for that.

"I think I was. Last thing I remember is a monster attack at the pool party."

Technically the last thing he remembers is finally getting to leave the pool party, but hopefully the description will help narrow down which pool party he means. He could have been stuck underground, dead (ha) to the world for months. He was certainly several Staywells down when he woke up.