The reality tether

[jaylake]

"These were failures of competence and judgment, and they were the result of having terrible ideas that were untethered to reality."

- http://www.theamericanconservative.com/larison/rubio-doesnt-think-he-needs-to-move-beyond-the-bush-era/

Shouldn't that be "untethered from reality"?

It seems to me you're tethered "to" something, but untethered "from" something. Or is my idiolect non-standard?