Hm...alright, I think I've more or less got the hang of this now. It's still a bit tricky, but I've managed to get ahold of some semblance of control with this technique...I can sense the traces of my blood flowing through the Alters attacking the school more clearly and accurately now.
I was currently standing atop the rooftop of the main school building, spreading out long tendrils of blood to use as antennae to help me better pick up the sensation of my blood in the bodies of these Alters attacking the place.
And if I really focus, I can kinda tell what state they're currently in, though it's a bit vague. I'm sensing a few presences very faintly, and based on their lack of movement, I think those ones have probably been defeated and restrained somehow.