The opponent, during their turn, broke through the library's guard and moved to a cell next to it, making it impossible to enter the library by land.
During my turn, I noticed this, and I had movement points left. I used Fly, but the game wouldn't allow me to fly into the library with a +2 all bonus, even though the opponent had already broken through the guard.
So, the question is, why does the game restrict me from making this move in this case?

UTC+03:00, icq 593626431