User blog comment:Caporai/Kabu'Naar the Scourge of the Sands/@comment-4515660-20120422093605/@comment-3286233-20120423135910

He can do other stuff while the preperation is active. It functions like Zilean Chronoshift when the target has protective rune on them.

Just you know that both Nasus and Renekton's ultimate in 120 seconds cooldown, but since Kabu'Naar's ultimate requires a kill at preperation moment, which is hard to pull, I may reduce it even further as you say.