Perfect skating ice usually does not last for long. A snow fall makes evaluating ice quality harder. The video was filmed on a section where waves formed along the Gulf of Finland and the Baltic Sea starts to break ice. The outer edge will break first, forming a barrier of crush and possibly pack ice. A bit further in waves still travel, but under the ice that bends unless the waves are steep enough to break it, initially to large skateable sheets of ice that as waves continue, break into even smaller sheets. Here the waves limited the skating area most.