Baron Bug

Okay, so I was in a solo match, toying around with some random ADCs to pass the time, and I found if I stand right behind baron, a little bit more down in his bottom right area (assuming you're facing into his pit) he won't activate any of his abilities, dealing only 35-36 magical damage per second, not activating , or anything, just occasionally his spike attack around his backside that stuns momentarily. This allowed me to solo baron, without any abilities used, on champions who aren't even auto attack hyper carries (jinx, and kog for instance) to me this seems like a major exploit. Sadly, my attempts to record it didn't quite turn out well. (FPS issues and the like) but it gets the point across for how little damage I was taking.

Baron wouldn't use it's overhead splashing down attacks that generally chunk heavily. Am I just crazy, or is this abnormal for baron?

I apologize again for the poor FPS and the windtunnely effect, for some reason my computer won't let OBS use any of my upload bandwith, and I forgot to mute my mic/shut off my fan.