Clary Fray: How did you do it? You activated a rune without your stele.

Jace Wayland: I don’t know. Saw you lying there. And it just kind of… ignited. On its own.

Clary Fray: None of this makes sense. But we’ll figure it out. The two of us.

From Shadowhunters – Season 2 Episode 11: ‘Mea Maxima Culpa’ (2×11)