Well— [rin pauses.] It's not exactly handing it out, Eren. I've placed the "potential to use my magical energy" in the mistletoe residue I sprinkled all over the city.

Once someone speaks the activating phrase, the magical energy flows up, and it draws moisture and life force away from the fresh plants surrounding you, killing them.

[she's patient, taking the time to slowly recount how the magic works in basic terms. even if she jabbers on like she assumes everyone should just know and not ask questions, she's actually quite willing to explain her reasoning.]

The magical energy was only ever my own. You're "borrowing" it, and it's a very casual sort of borrowing, at that.