The part I am referring to is when the Destroyers start blasting them and they got onto the elevator. When they get on the elevator there are battle droids? So is there a reason why the droids don’t shoot? Or was it just because of comedy? (I haven’t read the Revenge of the Sith novel, so I don’t if there is an explanation there)
One of the droids orders the Jedi to drop their weapons, which they obviously don't do, but presumably the droids were hoping to arrest them without a fight, using strength of numbers to sway things. Ultimately the underestimated the Jedi's abilities in this instance. It wouldn't be the first time battledroids tried to arrest someone rather than shoot first, such as in the Theed hangar before the Queen's group escapes in TPM (or indeed, slightly later in ROTS when the Jedi are trapped in the ray shield or on Utapau).
Huh I forgot about the escape in TPM. Well for the other two I thought it was clear. Grievous traps them in the Ray shields and wants to personally meet the famous Jedi. Anakin has some sort of “reputation” as Grievous says and he also calls Obi-Wan the “Negotiator” so I thought that explains it. Also on Utapau I believe you mean when Obi-Wan jumps down to Grievous and all the battle droids. I always assumed that Grievous wanted to personally defeat Obi-Wan who is a Jedi and has a reputation to collect his lightsaber. He keeps lightsabers as trophies so he makes a sport out of killing Jedi and it isn't uncommon for a hunter to take pride in the "dignity of the hunt". Which sounds more glorious; killing a Jedi by ordering all your droids to fire or defeating him in single combat? Well thanks for your explanation.
yes the plot, thus the script page required them to not die and escape ergo, the droids did not fire.
Putting aside the obvious 'the plot requires for them to not die', I think the idea is that the standard order is 'capture or kill'. If the persons (Obi-Wan and Anakin, Han and Leia) resists, then obviously kill them. It's the same reasoning behind, "Lord Vader, this is a rebel [Luke] who has surrendered to us. Though he denies it, I believe there may be more of them and request permission to conduct an extensive search in the area." Luke surrendered, so the guy just took him captive rather than blast him to death.
I believe droids NEED to try to arrest them first, because if you program the droids to directly shoot to kill unidentified people, that would create a lot of problems. Droids could accidently kill the separatists allies when their photoreceptors can't clearly see or the people who decided to join seperatists or surrendered etc If the droids went directly for killing, I believe the Jedi's Force sense abilities would work earlier and they would be more cautious anyways, since the droids first asks them to surrender it looks like Jedi's Force sense doesn't work but it does, since there was no danger in that moment and they handled the droids easily.