He grabs the centipede chain and starts to crack it like a whip. Luckily it doesn't work the way he intended, and all the centipedes break apart. Seeing this, the sewer person becomes sad, and sheds a tear that lands in the sewer water, turning it into every color of the rainbow. This means there's a chemical leak and you should probably leave. You can either take the door that says "secret exit", or the door that says "forbidden exit".