Why did Andy trip?


The three of them were escaping the advancing alien, then ran down some steps into that blue layer of mist (a kind of protective warning system for the eggs seen in the first film),

Andy puts his hand in it and falls to the ground?

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Theory proposed but not solved here...one of many unsolved mysteries in this film

https://www.ign.com/articles/alien-romulus-the-10-biggest-burning-questions

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Wasn't he hit by a xenomorph?

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Not sure, possibly.

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