At the beginning of Thor Ragnarok Heimdall is not seen as the Bifrost keeper, but was given the all seeing power by Odin. But in the movie Odin was not present at Asgard. So he couldn't give the power to the new keeper. So how can a keeper who can't see everything guard the Bifrost?
1 Answer
Heimdell has the power of seeing, but Skurge didn't. So, they used some sort of communicator to listen Thor from other realms. When Thor asks to bring him back to Asgard after getting the crown of Surtur, we see his voice coming from some sort of radio device at Asgard. I can't get the picture at the moment, though.
Although we don't know how this device worked and we may never after the Asgard is destroyed.
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A J What about others rather than Thor? Will they give everyone a communicator? Are you sure about the scene?– iamgrootDec 1, 2018 at 5:16
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Since Odin wasn't there and Heimdell didn't give anyone his seeing power, they had to use some other option like a sort of communicator. You can hear the voice of Thor coming out of that device.– A J ♦Dec 1, 2018 at 5:24
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@AsifIqubal The vast majority of Asgardians don't go off-world, so Thor is probably the only one needing such a communication device...– DaveDec 4, 2018 at 16:16