Boredom.
Where ever that costumed clown was, he was hiding good. Was he scared of the greatness of Kyuuri, the Super Saiyan in the making? That was all well and good, but with how he was hiding, and the fact that he had some weird power to mask himself from even the senses, Kyuuri had grown bored.
He began to seek elsewhere for an adequate challenge. He thought that clown on the island the other day would have put up a better challenge, but that turned out to be pretty disappointing. The brute was strong, but had no speed. With the strange energy field that surrounded Edge City, the makers of it had to have sorcery or other kinds of strange powers. Fighting them probably wouldn't prove fun at all.
There were other powers in this world. Other powers that would keep him entertained until such time that Vigilante decided to crawl out of whatever hole he was hiding in. Somewhere in this world, two strong powers were clashing. Kyuuri decided he wanted into this clash.
At an almost unbelievable speed, the Saiyan took off towards these powers...