just block punches if they are a minor...
thankyou Spence!
and or you can do the sticky hands martial arts technique where you get ahold of them and
NEVER let go, pull their shirt over their head
and let them know
what you know....(gives ya time to talk) like their address, their name ,the parents names too

go have a talk with them.... and let "them" police their kid...
theres a sign in my doctors office that says...
if it isnt documented
it never happened....
so that picture ............is worth its weight in
gold.