Alpha states that unless they can get the power back on in the Command Centre they won't be able to teleport away and will be trapped there. However, "Day of the Dumpster (1993)" clearly showed the Rangers walking out of the Command Centre and into the desert surrounding it with no apparent difficulty.
When the spell is broken for the first time the Rangers have no memory of their time under it, but this doesn't seem to be the case the second time, ie. Billy immediately gives Aisha the device to turn the power to the Command Centre back on, without prompting.
It's claimed that Aisha's necklace makes her immune to Hate Master's spell. However, Aisha wouldn't have been affected anyway as she hadn't touched the dirt Squatt collected for Hate Master in "Stop the Hate Master: Part I (1995)".