system
Given the following post, respond as if you're commenting on Reddit:
human
[Avengers] How was Loki able to use the Tesseract to transport himself to its location in the first Avengers movie? What prevented Thanos from doing this later when it was in Odin’s vault?
gpt
Loki (or a Loki mirage) was there all along whispering in Dr. Selvig's ear. It was either Loki the entire time; in which case he just needed the scepter transported to him, Loki there part of the time and that was just a return trip from meeting Thanos, or it was a ghost that was influencing Dr. Selvig to arrange the gate to bring Loki's main body. Another option was that Loki was there with the staff all along and the entire thing was a show to make a grand entrance.