Pelo que eu posso dizer da Novelização Oficial do filme, a decisão de Mace Windu de ameaçar Fett (em vez do próprio Dookan) parece ter se resumido a dois motivos:
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Embora Dooku seja um poderoso ex-Jedi, Mestre Windu evidentemente julga Jango como o inimigo mais mortal, observando seu lança-chamas e habilidade de voar, ambos os quais são especialmente perigosos para um Jedi.
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Gunray acabara de ordenar que Fett matasse Padmé. Ele queria garantir que isso não acontecesse.
“No!” Nute Gunray shouted back at him. “Jango, finish her off!”
Jango turned an amused expression Nute Gunray’s way, and nodded knowingly as Count Dooku motioned for him to stay put.
“Patience, Viceroy,” Dooku said to the fuming Gunray. “She will die.”
Even as he spoke, even as Gunray seemed about to explode with rage, the Count motioned back to the arena, and the Neimoidian turned to see a group of droidekas roll out from the side paddock. They surrounded the reek and the three prisoners and opened and unfolded into their battle position, giving Anakin no choice but to pull back hard on the makeshift rein and halt the creature.
“You see?” Dooku calmly asked.
The Count’s expression changed, though, just for a moment, as a familiar hum began right behind him. He glanced to his right quickly, to see a purple lightsaber blade right beside Jango Fett’s neck, then turned slowly to regard the wielder.
A novela júnior do filme também deixa claro que Fett está presente como guarda-costas de Dookan . Imobilizá-lo pareceria um primeiro passo sensato para capturar seu mestre.
The Viceroy snorted and turned back to the arena. Amusing as it was to watch his frustration, it was time to end things. Dooku signaled surreptitiously, and his hidden droidekas poured from gates all around the arena. The crowd cheered and Nute Gunray sat back in satisfaction, but Dooku sensed only a feeling of chagrin from behind them where Jango Fett was standing. He turned to see what his bodyguard had noticed.