Sorry, but this ice rink story is quite dubious:
According to Mayor Wolfgang Heitmeier, the city had the snow load on the hall measured as late as Monday noon. The limit value for the hall roof was not exceeded in this case. An ice hockey training session scheduled for 4:30 PM was nevertheless canceled. Today, Tuesday, the snow was supposed to be shoveled off the roof.
If the training was indeed canceled, there must have been specific concerns. If these concerns existed - why wasn't the hall simply closed? Somehow, it sounds like someone didn't think very far ahead. I wouldn't want to be in their shoes; some mistakes you just don't want to make.