Fianto Duri.

Junia had read about that one and while she could repeat its purpose using different words, she didn't really want to. It was absolutely boring hearing the same answer over and over. That left spells Fianto Duri could be partnered with, yes? There were a few options to choose from there.

"Professor, you could use it with the Locking Spell. It'd buy you time to escape harm or prepare to face whatever was coming after you."