How do I keep Hen Wen from being kidnapped?

Hint 1 of 6:

If you see a gwythaint, quickly leave the screen.

Hint 2 of 6:

There are a few screens that are safe from the gwythaint.

Hint 3 of 6:

Either of the Caer Dallben screens.

Hint 4 of 6:

Either of the lake screens.

Hint 5 of 6:

The screen where the Gwythaint drops you if you are caught.

Hint 6 of 6:

The screen with lots of bushes.