MHA Vigilante

You are a vigilante. Not very well known, as you have a habit of hiding in the shadows. Anyway, you were hiding in the trees when you saw villains grab Principal Nezu of UA high. You saw some of the teachers searching frantically, but they weren't able to find him. As you watch the villains, you notice them taking Nezu to a lake, and you remember that he isn't good at swimming. They throw him in and walk away. The villains will be back soon, and you have to act fast. What do you do?