Greetings,
Yes, this is a very nice video of the movement of a vessel in stormy weather.
This is completly normal when a vessel bends,this is the strenght of a vessel.If this was not the case,it would break in notime.Compair it with a building in a heavy wind,that moves to,however you dont see it.
Also when this was not the case,that building would collapse also in notime.I have to say this is a very good video on the energetic forces,which fight on this vessel.
Sorry,i cannot write in german,so maybe Bottman is willing to translate it,and is able to give some more info in german,so that you can understand it more better.
Kind Regards
Marc