back up(в повествовании: I want you to back up for a second. You mentioned you had seen the victim one week before the crime. Tell me more about it.ART Vancouver)
retrace one's footsteps(If you are in a minfefield, it is only recommended to retrace your footsteps as a very last resort, and only if you can see the impression of your footprints on the ground clearly.4uzhoj)