Enemy NPCs should behave somewhat intelligently, using cover to their best advantage in combat. If necessary, you can actually use this as a teaching tool to get your players to understand and improve their own battle tactics!
Commentary by memnarch (who has not seen the movie)
Completely unsurprising this is. Well, unsurprising for Jim playing Zeppo. I am a little surprised that Han and Chewbacca both seemed to have missed their initial shots. Especially Chewie; even if his arm still hurts, stationary unaware targets are a lot easier to hit than moving ones.
Really, the only thing that seems to be reasonable armor in the Star Wars universe is plot armor. If you get shot, you'd better hope that you've got plot armor of some kind otherwise you're a goner. None of the body armor that I can recall has actually done a single bit of good against getting a blaster bolt in the chest, so all of the main character hits are in the limbs if they'd be lethal. Or they're droids that can easily get put back together later without issue.
Is this meant to be a distraction of some kind? This has to be one of the noisier entrances a character has had in the series so far, plus Rey and Finn aren't mentioned. I guess a sneaking mission by them could be a good way to blow up something critical, but wouldn't that also need the knowledge of where to go in the first place?
Zeppo: Chewie and I enter the hexagon via this door here.
GM: You see two troopers at the far end of a corridor, minding their own business.
Chewbacca: So they haven’t spotted—
GM: The troopers sensibly take cover.
Zeppo: I advance straight down the corridor, firing!
GM: You’re fully exposed to return fire.
Zeppo: No, I’ve still got my snow jacket on.
GM: That’s not even a +1 to armour class.
Zeppo: It completely protects me from exposure!
GM: We’ll see. <roll> <roll>
[SFX]: Pow! Pow!
[SFX]: Miss! Miss!
GM: One of these days I’m going to be right...