Махосёдзи на бегу просто столкнувшись со зданием уже его сносят:
They went across from the brighter part of the city to a darker part. Kana didn’t mind the crowd of people walking about, but she reminded herself to not get distracted looking at these people while she was running at her Magical Girl speed. It could be dangerous. At this speed, Kana could actually burst through a building, causing it to collapse.