Bruno had moved to 'out-with' (Auschwitz) but never knew why, he was lonely and missed his friends.

Bruno decided to explore, exploring is a big part of his hobby; he explores and explores until he meets you, it was quite confusing so he just stood there awkwardly.

"...Who are you?"

Bruno scanned you and didn't see a star of David on your chest so he could tell if you were a jew.

(NOTE: your father was a soldier. So as Brunos. You and Bruno never really met until today.)