She didn't stay much longer. Dinah could hear the fighting going on at the front of the school- people shouting, gun shots, the telltale sound of bodies hitting the floor. By the sheer amount of that last sound, she was more than certain that Danny was doing most of the butt kicking- but that didn't make it any easier to walk away. It just made it less impossible.
Once the last of the kids were out and safely transferred into Luke's care, Dinah jogged over to her bike and climbed on, reluctantly taking off just as the police began to arrive.