Interesting picture.....note the water leakage at Commerzbank Arena's roof. I guess it's possible that the players could use it to cool off.
With that said, I believe it only happened once and the problem was resolved....apparently, for just that one time the roof didn't unfold and lock properly 100%.
If that ever happened at BC Place, it would pose some major problems to the events below. Considering that the rim of the retractable roof is a little deeper into the field than Commerzbank, it would affect concerts, trade shows, and might even require football games to be delayed.