I think you missed something when you watched Hide. But, to be fair, maybe I didThat's not the same thing.

What rule are you referring to?It establishes a specific rule...
In Hide, it's clearly stated the TARDIS can easily *enter* the collapsing magic ghost pocket universe, but it runs the risk of having it's power source drained (and thus getting trapped). It's portrayed as risky, and the Doctor opts to use the psychic lady to create a portal.
(I suspect this was meant as characterization of the Doctor: he chooses to place an innocent young woman under duress rather than risk his TARDIS -- making him a bit like the "sliver of ice in his heart" kind of guy the psychic lady warned Clara about, also a bit more like Moffat's Holmes, despite the superficial frantic kid-show host element to Smith's Doctor).
Are we not talking about the same thing?
I think the intention was for the TARDIS-trip into the pocket universe to be risky. Because that's what the episode said. At no point was it stated to be impossible, so no further explanation of how it occurred was required.Having re-skimmed the episode, I think the intention may have been that the psychic's efforts somehow made it possible for the TARDIS to go to the pocket dimension and safely return. But if that's the case, the writer completely failed to deliver it in a coherent fashion.
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