After you have gone through all the tests... and finally you defeated his robot "Slapstractor"... after his robot exploded he was in great confusion, but he took the glove "Flash" with which he can teleport behind your back.. .during the battle in the arena, meteorites fall on you... you just need to throw him out of the arena and let him fall into the void

"You shouldn’t have come here, little guy... your path ends here and now, because I only want to listen to the birds singing."