By Water .-- Here is the safest way, in one respect, but with most danger in another.

On the water he is powerless except at night.

Even then he can only summon fog and storm and snow and his wolves.

But were he wrecked, the living water would engulf him, helpless, and he would indeed be lost.

He could have the vessel drive to land, but if it were unfriendly land, wherein he was not free to move, his position would still be desperate.
We know from the record that he was on the water, so what we have to do is to ascertain what water.
The first thing is to realize exactly what he has done as yet.