Just guessing, but maybe your SF has a high driving skill? That might lead him to take more shots.
I also see that his opposing SF got a very low mark. Maybe he played a bad defense and left many inviting open shots to your player.
Additionally, your SF played the entire game, so he was probably tired in the late minutes, depending also on his stamina. You could check to see what was his shooting % at the start of the game. 10-29 might not be a bad %, if he missed 10 straight shots in the final quarter. :)