system
Given the following post, respond as if you're commenting on Reddit:
human
[Thor:Ragnarok] Why didn't Heimdall warn Thor that Loki had usurped Asgard's throne?

 At one point in the movie Thor calls for Heimdall and he uses his powers to teleport Thor's vision to Asgard, why didn't Heimdall use the same ability to warn Thor about Asgard's situation? I believe Heimdall knew that Odin was not who he appeared to be, for Heimdall fled when Loki sent soldiers to arrest him and as far as I know Heimdall would not disregard an order given by the king of Asgard.
gpt
Heimdall was really busy after he was exiled. You know, wanted for treason, keeping a low profile, gathering intelligence on the Odin impersonator, all that. It would be politically disastrous if knowledge spread that Odin was had gone missing. Thor is the opposite of low profile, and Heimdall knew he was busy fighting villains across the Nine Realms and looking for Infinity Stones, so he didn't bother reaching out. He was probably planning to once he had more information.