User blog comment:Xilinoc/Ch. 648 - THE THEATRE SUICIDE SCENE 2/@comment-27106822-20151022152615/@comment-25121259-20151023025211

Actually, they usually do ? They are quite descriptive in a sense, it's just that the longer the command becomes, the harder it is to understand it. Those usually reveal what the Zan does, what becomes of the weapon, or reveal it's nature. For example, "Scatter" literally describes what happens with the weapon that splits and scatters away, or "Blacken" describes what it does (as it blackens/paints black everything). What's more, they are often nicely paired up with the name of the Zan, like "Fulfill"-"Gourd", or "Cry"-"Cricket".

In Ukitake's case, it references his Zan's ability to take what comes towards him as his own. Hence, the crushing waves that come to crush him, become his shield instead, the thunder that was meant to strike him, becomes his to wield, the Cero that was fired against him, becomes his and is thus fired against his opponent.

The same goes with Kyouraku's case, I rage so you rage, I play a game so you too are forced to play the game. The rest is basically heaven or hell, as in one ascend to heaven (wins/survives) the other descends to hell (dies/losses), only then the game ends when one losses and the other wins. Well something like that.