I would say the landowner was more accomodating than he had to be by agreeing to flip a coin. Even so, with a kid involved I would have conceded the buck to the young hunter and congratulated him and helped him with the recovery from my land. But that is just me.
By rights, the buck was the landowner's and he did give the kid a shot. Kid just got beat in the coin toss. Sometimes a boy needs to take it like a man to learn how to be one.