Kizaru charged up to deliver a massive blow to Sentomaru. Then soon realizes it's actually him who felt the impact and wrath of massive damage, it came from Luffy's punch in the sky, like gods punishing the filthy mortal side characters (that is Kizaru), then his entire life flashes before his eyes.
His last words: "It was a happy wage-slave life!"
A tear drops from Kizaru's eye as he disintegrates.