get a pool ball and throw it through the hoop
There's a bunch of soldiers out the back of the school doing target practice you can find the pool balls under the basketball hoop they're shooting at.
Thanks, I managed to 100% this episode. I'm missing a couple of challenges, but I don't care.
Really is a challenge to sneak around this level. Sapienza I felt like I could run everywhere I wanted.
That said, finished a SA/SO run last night. Took me awhile.
Actually it's pretty easy when you beat the level a couple of times and discover the shortcut on the roof of the headmaster.