During a game of hide-and-seek at the park, Tom sees his friend Lucy hiding behind a large oak tree near the playground. As he continues searching for other friends, he spots another friend, Jack, also hiding nearby. Unbeknownst to Tom, Jack has seen Lucy as well and decides to switch hiding spots with her when Tom isn't looking. When Tom finally finishes counting and starts seeking, who does he expect to find behind the oak tree, and how might his expectations change if he knew about the switch?

Respond very briefly.
Tom expects to find Lucy behind the oak tree because that's where he saw her hiding before he continued his search. If Tom knew about the switch between Lucy and Jack, he would then expect to find Jack behind the oak tree instead of Lucy. This is because his updated information would be that Jack took Lucy's place as the person hiding behind the tree. Tom's expectations change according to the latest information he has about where his friends are hiding.