It takes a lot of practice and only a few can do it reliably. It's also uses about twice the usual amount of magic, so the person trying it has to have a good store to even think about doing it. Fortunately, we are not going far. I have more than enough stores to take care of this.

[He gives Noctis' hand a squeeze, and, before the young man can object to the extra magic use, summons his sword and sends them on their way with a crackle of crystal.]