It's the same gesture he makes when he comes home after a long day, turns off the key in his car and says, "Aah, I'm home." Because we all know where home is.
彼はきっと家に帰って 長い一日、車のエンジンを切って、言う： 「ああ、帰り着いた」　みんな帰る場所がどこか知ってます