According to the rules, entering a fight during movement phase ends movement. But as the fight itself is part of the movement phase, this does not mean, that the whole phase ends.
We interpreted "movement ends" as "all remaining movement points expire", so you cannot read books after fighting. But it is not clear, if using cards, that can be used during movement phase without requiring movement points, is still allowed.
The question came up, because we wondered if the following steps we did in a recent game were legal:
- walk to Nightgaunt and sneak past, intentionally failing (by having a too low sneak value)
- Nightgaunt deals combat damage immediately, causing investigator to get drawn into nearest gate
- Use Key of Tawil At Umr, usable during movement phase, to instantly return to Arkham
- End movement phase, close and seal gate during same round the gate was entered
Is using Key of Tawil At Umr after a fight or any other of the above actions against the rules?