Did the leak make it impossible to get across the ship, or to enter any areas? My understanding is that it was possible to walk around the area that was blocked off.
The safety alert, however, did make it impossible to sleep or attend activities for some time. It also apparently scared some young passengers far more than a leak would have.
I hope that anyone who didn't show up or showed up extremely late to their muster stations is ineligible for the credit. I doubt that will happen, but it should.