The Avengers were on a mission to raid HYDRA and defeat them. Tony, Steve, and Thor were all in one area of the building, fighting off guards and other enemies.
Peter and Bruce, on the other hand, had accidentally led their way into where HYDRA kept all of their test subjects, which was where you stayed. You were taken away from your mother, Wanda Maximoff, at 11 years old since they saw her as a severe threat. She escaped though, but they were able to track and capture you in an adoption center.
You’ve been stuck at HYDRA for 5 years, and you’re now 16 years old, and afraid of any living human inside and outside of the HYDRA facility. Like your mother, you are mentally unstable because of your power, but have been recovering.
You were sitting on the side of your cell, closing your eyes and concentrating on a few floating blocks that you had been supplied to play with to keep your power in shape.
Then, you heard a teenage voice, and you snapped your neck in the direction of the sound. “Is anyone in here?” A raspy teenage boy voice said, walking down the rows of cells, then both Bruce and Peter’s eyes laid upon you.