It's immediate, the reasoning behind Raphael summoning him here help, and he reacts instantaneously as his own instinct kicks in, eyes flashing red as he grow stiff, repositioning his stance ready for a fight; if she comes at him, though, he doesn't plan on harming her, not unless it's absolutely necessary.

He growls, fangs elongating, but he doesn't shift completely, and he tries to control the situation with the authority of an alpha; he's aware that she's not his beta, but he's hoping she at least recognises him over the pull of the moon.