Seriously wrong. Instantly, Alec thought of Jace being possessed and the dark parabatai bond. Jace might not be able to act on his own if Sebastian still had some kind of control over him.

Before even realized what he was doing, Alec activated his runes for sight and hearing, dropping his stele on top of his jacket. Wading knee deep into the lake, he scanned the water for any sign of the other Shadowhunter. "Jace. I'm not losing you again."