Howling:TARDIS Explanation Please
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The Howling → TARDIS Explanation Please
Can someone explain to me why sometimes during the show, Rose will ask the Doctor if they can use the TARDIS to jump back a few hours before bad situation X started happening, and the Doctor will say they can't because they are part of the events now? What exactly does that mean? Why does that stop them from using the TARDIS? Is this something covered in the older seasons?