BUZZFEED – A small police force was pinned down behind a makeshift barricade of smoldering car chassis and fallen slabs of concrete on the set of Avengers: Age of Ultron, its gunfire no match for the relentless onslaught of hostile robots of the film’s title, barreling down the barely recognizable city street. The windows of a nearby high-rise exploded in clouds of billowing black smoke as extras attempted to flee the carnage raining down all around them. If there was ever a time for one of the Avengers to swoop in and save the day, it was this moment.

But instead of Iron Man (Robert Downey Jr.), Captain America (Chris Evans), Thor (Chris Hemsworth), Black Widow (Scarlett Johansson), Hawkeye (Jeremy Renner), or the Hulk (Mark Ruffalo), a man in dark motorcycle pants and a body-hugging silver shirt sprinted into the middle of the action, carrying a woman in a tattered black dress and stylish red jacket in his arms. They looked less like superheroes, and more like European party kids who’d just emerged from an all-day rave and accidentally stumbled into chaos. The man skidded to a stop and the woman flew out of his arms — and directly into the path of the oncoming Ultrons.

But there was nothing to worry about: She was far from helpless, and he was always on his toes. They were twin siblings Wanda and Pietro Maximoff, also known respectively as Scarlet Witch (Elizabeth Olsen) and Quicksilver (Aaron Taylor-Johnson) — the newest members of the Avengers franchise.

As the actors and extras set up for the next take, writer-director Joss Whedon explained to BuzzFeed News why Pietro had been carrying his sister. “They have a lovely expedited form of transportation,” he said with a smile.

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