Use your sonic burp to counter-attack him.
From Create Your Own Story
You sonic burp and his laser is shot into the atmosphere, bounces OFF the atmosphere, and comes straight back down to earth! It's grown immensely large since you first saw it, now the size of a skyscraper! It suddenly incinerates the city with a flash of lights!
After the disaster is over, you're still alive, but debris is flying everywhere. The only sound you can hear is the wind howling and the screams of the aftermath.
Avenge your city and find the guy who shot the laser