Many viewers complained about the apparent inconsistency where Chopper's wristblades immediately melt when they come in contact with Alien blood, yet the same does not happen with Scar's knife used to cut the Alien head. The novelization of the movie explains that while the wristblades were made of corrodable material, Scar's knife is made of sharpened Alien bone, which, like Alien skin, is impervious to its own acid.

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