system
Given the following post, respond as if you're commenting on Reddit:
human
[AOU] Spoilers, why not Asgard?

Is there a reason they chose to hide out at Hawkeye's with Lindsey Weir instead of having Heimdal bifrost them up to Asgard?  Asgard would be completely out of reach of Ultron so would be a perfect place to regroup.  Also is there a reason Thor didn't ask for a bunch of Asgardian warriors to bifrost down to protect Earth in the final battle?
gpt
Thor has just seen some terrible visions of Asgard getting completely wrecked. Its not in his vest interests to take the Avengers to Asgard when they're seemingly safe with Hawkeye. Thors priority is figuring out exactly what he saw and how to stop Rakgnarok, which is what Heimdall mentions. Its natural that he would be wary of doing anything to set the events of Ragnarok in motion, including getting the most destructive people he knows to his home planet.