Reverse the section, not always the whole clip
Whole-clip reversal is rarely what you want in finished work, because everything including the establishing shot runs backwards. Reversing a chosen section lets you keep the video reading normally and put the effect where it lands — a single action played back, then normal footage resuming. Choosing the section carefully also controls the cost: reversal requires holding decoded frames, so a short section is far lighter on memory than a long one.