His feet seem to be nailed there, that is to say, his feet seem to be nailed there and stand still. This sentence describes a person standing still in a place, just like a telephone pole, just like fixing his feet on the ground with nails.

If in reality: the fixation method refers to temporarily disabling the other party without hurting the other party. It used to be a fairy tale, but with the development of science and technology, it gradually became a reality. The scientific method is to use strong sound waves to make people "stay" and temporarily lose their resistance. It uses a special laser beam to do "in-situ magic" far away from people. This kind of laser beam can make people contract and twitch, but it won't hurt or move.