I'm certain it was for the runway to re-open. They were out clearing runway 2 but the original plan was for 05L ops to resume at 09;30, then 09:45, it was only at about 09:40, when the next delay to re-opening 05L was made to 10:00 that ATC knew that runway 2 would be cleared and ready before runway 1 was repaired that new clearances were given and movements then commenced a few minutes thereafter.