Colossa got to take on Boku as the Krazy Bee fighter was looking to recuperate from a title loss to Shinya Aoki in Kings & Champions in April.
The South African had been marked as the underdog for the fight, though, as he had not achieved an MMA victory in over eight months.
But the Epic MMA man succeeded as he avoided Boku's characteristic over-and-under hooks and regularly attacked the 36-year-old's legs with inside leg kicks.
Colossa opined that it was a battle of the mind as much as it was one of fists and kicks as he had figured out Boku's fighting style through some careful observation early into the first round.
"When you fight a typical striker, boxers like Boku, it's all about timing the footwork. You can predict almost every punch they're going to throw," Colossa explained to Sherdog.com after the fight.
"If I had gone forward and just attacked him, he could have knocked me out, you know.
"So I just wanted to see how he moved so I knew when I could strike him. Whoever fights smartest gets to win the fight and I guess I did just that.
"Everyone predicted that I would lose but tell you what, he might be more experienced fighting in MMA but I'm more experienced in striking.
"Look at my record in muay thai and kickboxing, I've fought much more than he has in his MMA career.
"Today, it was time for me to prove it that I can beat anyone when it comes to stand-up."
The Hong Kong-based fighter also ambitiously called out Aoki for a fight in the post-fight press conference and expects such a match-up to be an enthralling fight to watch for MMA fans in the region.
"Like I said, the campaign since the beginning of my One FC career has been to get the belt. I want to fight for the title and if Shinya is holding the title then I hope he will be next.
"If the One FC management ask me to do that then I'll be ready. Fans want to see an exciting fight and I think me and Shinya could have one of the greatest fights ever - a typical striker and a worldclass jiu-jitsu fighter, it would be one of the amazing fights you would want to see.
"Everyone, even in Africa, will want to see it so I think that's the fight that needs to happen for One FC."
Image courtesy One FC