If you are thinking of walking or hiking here, be warned that mists descend suddenly; you may want to go with a guide .
The mists here don't have any sudden descents so a guide is never necessary.
mnli hypothesis: The mists here don't have any sudden descents so a guide is never necessary. premise: If you are thinking of walking or hiking here, be warned that mists descend suddenly; you may want to go with a guide .