Obviously a successful hunt. But please convey the following caution to your son.
You should never stalk game with an arrow nocked on your bow. Broadheads are razor sharp, falls are unpredictable and more than one hunter has been seriously injured or killed by this unsafe practice. Once game has been sighted you can nock an arrow and carefully close the remaining distance.
My caution is/was not intended to be critical of his actions, but I'm sure we can all agree that they did present a "teachable moment."
You are to be congratulated for bringing up your children with a love for the great outdoors. Hopefully they will continue to hunt and fish with you for many years to come. Then like me, you car start instilling your values on your grandchildren. Life is not all bad.