Scorpius rushes over and helps her push the throne out of their way.

He looks at the key with a frown, then at the pendulum.

(He also spares a glance for the approaching guards.)

"Right," he says, coming to only one conclusion and what he can only hope is the correct one. "Be ready to dodge a spell and some angry guards if this doesn't work."

He points his wand at the key and fires off a spell before she can argue against it.