system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars: Revenge of The Sith] Why does Obi Wan leave stealth and jump right behind Grievous while a ton of droids are clearly protecting him? And it's not like he jump ON TOP of Grievous, just behind him. Arrogance or calculated risk?

I just thought it was a bit weird. It's something I'd expect Anakin to do and Obi Wan to reprimand him for doing so. Yet, in here, Obi is the one doing it. It seems like a REALLY bad idea it seems kind of foolish for a Jedi Master, no matter how skilled they are, especially Obi since he was sort of the more level-headed between him and Anakin. 

And as I mentioned, Obi Wan didn't even use the stealth to, you know, land a stealth attack. He just landed behind Grievous and even announced his presence. Just, why?
gpt
Obi Wan jumps down on General Grievous, killing him with a precise strike. Five hundred droids open fire upon him, killing him quickly with overwhelming fire.

Or...

Obi Wan announces his presence and Grievous duels him one-on-one, meaning the droids would not dare risk firing upon their commander. Meanwhile Obi-Wan could ensure the battle moved elsewhere by the time he won. Meanwhile the droids are without their leader.