Inside the tents, Hermione heard the rumbling collapse of the building. And the noises and shouts of people in alarm definitely get her moving outside, to see where she can help.

She can sense the magic being woven by Horvath as she gets close to him. Without her wand... she can not cast her own spells to assist the other magician.

But she can move into action quickly. "Quick!" She yells at someone else, who is nearby. Leaving Horvath to maintain his spell that are causing the snow to shift and rise.

"Help me get them out, while we have this opportunity." She looks for other materials that could be used to get the trapped people out.