My first impression when looking at the photo was that it was a very disturbing image of an angry adult threatening a college kid (no matter who it eventually turns out she is). Completely inappropriate and something that should never have been enabled by the juxtaposition of players and adults - keep them separated, there should be no opportunity for interaction and this kind of verbal assault.
My second reaction as I read further, and nodded my head with some BYers expressing caution, was that I really should cut the guy a break since I did not see images from before and after this shot was snapped, and that I needed context.
Then I pasted the image into software such that I could enlarge it and get in close. See the expression lines in his face (and his friend?), see the body posture, see the tension in his fingers. My reaction swung back to this being a hostile individual who should be reported and NEVER allowed near opposing team players. Hey there Mr. Wilson, at the end of the day, this is a game, a sport - and your daughter is playing, not you. Don't be so insecure as to invest so much of your worth and well being into the outcome of a game - he needs context, not us!
Sorry to the cautious ones on the board, but I'm dropping this guy into the bucket of people I never want to encounter, either in a crowded setting or on a deserted street. Gives me the CREEEEEPS...