Vampiric Show RP

You are a wanderer in a medieval-ish, coming through a town for a few days, to eat and rest, and you hear that there's a good show. Figuring it's some sort of circus or play, you go to see.
You pay admission and when you get in, you're horrified! You see some people torturing a someone in his late teens. As you watch the show, you figure that the one being tortured is a vampire, with him being repeatedly splashed with holy water, stabbed in the chest close to his heart by wooden stakes, and thrown into the sun by almost minutes at a time, all while screaming in pain. Since you see this as inhumane, even for a creature of the night, you decide to free him.
You arrive late at night, sneaking in, you look to find the vampire and you find him locked up in a cage like an animal.

What do you do?