Spirits are of those who have not completed a task and/or have chosen to stay for some other reason, or don't realize that they can go on to the next level. Some are just very ugly and evil and come back as watch dogs for worse forms of evil. Maybe the person of this spirit had a bad experience with water, that lesson was learned, so when the Tsunami came rushing in it's automatic response was to get out of the way and take cover. Or maybe it sensed evil at some level of the Tsunami and took cover. Who knows why????????? I'm just saying it sensed a need to get away from the Tsunami.
Take care of the land and the animals and they will take care of you!