Gau foh ying hung

The doors to the stairwells of the relevant section of the power station open toward the stairwell, via crash bars on the corridor side and via handles on the stairwell side. When Water and his two companions exit into the stairwell and rush down the stairs to the ground floor, they find that the handles of the door there will not budge because they are locked. In one shot, they are struggling to get the doors open, then there is a brief cutaway close-up shot to one of them beginning to reach for his smartphone, and in the next shot, the doors that they are standing before have crash bars rather than handles. It could be that these other doors were along an out-of-frame wall, but even if that is the case, the children's positions relative to one another do not match the previous shot, as though an entire sub-scene (of them trying to exit through this new door) is missing.

References La historia policiaca de Jackie Chan (1985)