Horvath is quick to levitate what he's been holding aside to a safe spot where he can set it down, all the while watching Hermione's quick directions. There's a nod of agreement, and as soon as he's free to begin that work he does, stepping back away from the complicated sigils melted into the snow and destroying the symbol of his enemies bit by bit as he carefully excavates to get at those trapped below it. This is tricky, careful work, and having Hermione's guidance is not only helpful but crucial, since he needs the extra perspective to keep from collapsing it all with a single wrong move.