[representing]

Thanks for the responses. I emailed a referee at USSF headquarters using that askareferee email address, and the responder said that there's nothing according to how I described the play. However, as I remember the play vividly, I would have definitely called the dangerous play on the falling player and then would have some explaining to do to the coach haha.

"BUT HE KICKED MY PLAYER IN THE FACE!!!"
"Yeah, but he fell near the the ball, putting himself in danger..."

EDIT: Additionally, I agree that if the player would have stopped and threw his arms up, I would immediately stop play and award an IFK. However, if he just taps the ball away to play it, I would have waited a second or two to see if an advantage is there.