My husband was all by himself,and remember,it was all dark ! All the lights were turned off in the whole building.Didn't even know he had caught it until we loaded on the PC the next day!
There were 4 of us, and No at that time my husband went back up stairs by himself, and was taking some last pics. Believe me , No One was up there but him. And we didn't even see this until we downloaded the pics on the PC. We were very excited!