It's nine minutes into a U9 game, yellow vs. white. Yellow is already up 5-0. Yellow shoots and ball is headed for corner of the goal. GK is slightly out of position but could possibly make the save. At older ages it would likely be an easy save. At U9, it's maybe 50/50 that the keeper would stop it. Defender is standing right in front of his GK and sticks his arm out and knocks down the ball. I give yellow a PK and send the white defender off for DOGSO. BOTH coaches complain loudly, yellow coach pulls a player off the field to equate. Then I realize I couldn't read the player's number that I hastily scribbled down so I go to the side to double check it. The kid is sobbing and an asst. coach is consoling him. White coach is pleading with me "It's the last game of the season, do you have to do this?" Yellow coach comes over and says "Please don't do this". How would you handle it considering the age group and other factors?