Factual error: In order to enter the Pym Tech building, they drop the pressure in the water main and Scott floats in on a raft of fire ants. Getting into it the supply line would mean they have to enter from the municipal main, which would be under full pressure. Even with reduced pressure, the interior pipe would still be full of water. Additionally, Scott would not be able to enter through a faucet unless someone had left it running (the valve would be closed).
Ant-Man (2015)
Trailers
Directed by: Peyton Reed
Starring: Michael Douglas, Paul Rudd, Evangeline Lilly, Corey Stoll
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Hank Pym: Scott, I need you to be the Ant-Man.
Scott Lang: One question... Is it too late to change the name?
Question: At several points in the movie, Scott Lang, while small, jumps into and punches a man, who goes flying backwards. However, in the battle with Cross after falling into the swimming pool, Cross, while small, jumps at him and Scott, while large, is able to effortlessly swat him into the bug zapper. A similar thing happens during Scott's fight with The Falcon. So, in a collision between someone large and someone small, who is supposed to win, and who is supposed to go flying?
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Chosen answer: Despite the explanation given in the movie for being able to reduce objects and people being "reducing the space between atoms", there are clear indications that there's more to it than that as that explanation wouldn't enable changes of mass (i.e. No way an ant could carry the full weight of a man even if he was reduced in size). Therefore there is some way of changing mass at the same time as size and the two aren't necessarily linked (Scott has low mass when riding ants but much higher when he's punching people). Based on this its apparent that when Scott swats Cross into the buzzer he had low mass. So the answer to the question is - it depends on the mass of the smaller person at the time of the collision.