This improv game is in the following improv game categories:
This is a format, and an performance trick at the same time. As a format, it can be used for Short Form performances as well as for Long Form work.
The premise is simple: Transitions between scenes are made by tagging out (a) player; the other player(s) remain in the scene and the person who tagged joins in, starting a scene at a different time and/or location.
TagOuts as a format are described in Art By Committee, and the book has good examples on the video included.