Important rule being shown here. If you're unfortunate enough to end up with with an arrow, spear, knife or other foreign object stuck in a newly formed hole in your body-LEAVE IT IN! It may be the ONLY thing keeping you from bleeding out before you receive proper medical attention.
Also, don't volunteer to hold the archery target for your son.(see above)
The holding of the arm may just be normal switching, while seeking a comfortable position, but the bow can be explained by an ambulance ride(no way the dad could get behind a wheel) and the kid bringing his bow with him. Then again, where's the quiver, and if you staged the photo, including the bow changes the tone from, supportive son accompanying dad to ER, to guilty son accompanying dad to ER.
Also, don't volunteer to hold the archery target for your son.(see above)