With King Buzzswole convinced that you can flex, now is the time to convince him for him and his subjects help. The shrine is still covered in peanut butter. And the volcano seems to be flowing with lava. Lava that, while hot, isn't actually searing you from heat to toe in body-melting pain. Go figure.

Now's the time. Flex mightily for their aid, and see if you can't get their aid to stop the lava from flowing into Mount Lanakila!