Sabriel's not naive enough to miss the implication. If she lets Connor do that, those people will be hurt, possibly killed.

Sabriel thinks of the broken Charter stones, of villages wiped out by the Dead, their inhabitants killed or fleeing, of the fear and fatalism she's seen in people's faces in the Old Kingdom. Her expression hardens.

"You can do that. If anyone complains, I'll deal with the consequences."

Anyone stupid or evil enough to work with that necromancer deserves what happens to them.