Brian teaches Justin the art of handballing.
For more information on the experience of fisting, I found this very useful and interesting. For a spiritual take on things, I found this unexpected and absolutely fascinating. I certainly never knew the Bible endorses fisting. Go figure. Take that, Rick Santorum.
Disclaimer: I own nothing.
Brian claims to have taught Justin everything Justin knows. Alas, we are left to merely imagine the details. This is a story in the collection of stand-alone stories, Everything He Knows