It's possible that the script was re-written so that the damage was supposed to be the result of Han dinging the rocketpack; the crew evidently packed some pyrotechnics into the cavity in the "damaged" rocketpack prop that were ignited when Harrison Ford hit Jeremy Bulloch (or his stuntman):
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However, looking closely at the actual prop, it's pretty obvious that it was made with the intention that the damage was caused by a beam of intense heat cutting
into the pack, not an explosion pushing outward, as can be seen in the curious regularity of the cavity's distinctly oblong shape, its rounded (rather than jagged) edges, and the liberally-applied spatter, as you'd seen in the wake of something like a plasma torch cutting through metal:
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There's an odd parallelism between Boba Fett and Darth Vader that goes back a very long ways. George Lucas originally conceived of Vader as a spacefaring bounty hunter, but although the character ultimately evolved a different direction, becoming perhaps
the archetype of the "Dark Knight" in western popular culture, the figure of the bounty hunter continued to kick around in Lucas's brain, eventually emerging to seize upon the proposed Imperial "Super Troopers" concept for the then-upcoming
The Empire Strikes Back and make it his own, reworking the pristine white armour designed by Ralph McQuarrie and Joe Johnston into the familiar battered green battlesuit:
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In ESB, Fett and Vader have an oddly familar relationship, with Vader apparently being well-acquainted enough with Fett's methods to single him out for a specific caveat about how the hunt for the
Millennium Falcon and its crew is to be conducted ("no disintegrations"), and Fett apparently being confident enough in his relationship with Vader to openly complain that he's potentially being shortchanged by Vader's freezing Han Solo in carbonite, a gripe that Vader oddly takes in stride (after having spent a good preceding portion of the film throttling various subordinates who questioned his methods or otherwise provoked him), almost as if he was dealing with a younger sibling rather than a mercenary contractor. Much of Fett's behaviour and appearance stands as an inverse parallel of Vader's. Where Vader commands entire fleets, Fett is a loner. Where Vader's armour is pristine and monochrome, Fett's is battered and multicoloured. Where Vader is armed only with a lightsaber, Fett has seemingly no end of weapons secreted about his person, and so on and so forth.
With the advent of the prequels, the parallels continued to pile up, albeit no longer inversely, for the most part. Over the course of the Prequel Trilogy, we find that both Anakin Skywalker and Boba Fett are introduced as precocious 9-10 year-olds. Both are being raised by a single parent, to whom they are profoundly attached, and both are essentially unnatural beings, the one having been created by what amounts to a spontaneous act of God and the other artificially gestated in a tube. Both of them are profoundly affected by witnessing at first hand the violent deaths of their beloved parents (although where Anakin immediately flies into a rage, Boba is silently mournful and contemplative, perhaps to serve as a call-forward to ESB, where his cold-blooded cunning allows him to successfully track down the fugitive Rebels when Darth Vader and an entire Imperial Navy taskforce have failed).
I don't really know where Lucas was or is going with any of this, but if there's one thing I've learned about
Star Wars over the past few years, it's that very little happens in Lucas's six movies without some kind of intense reasoning behind it.