Thessaly takes the scene in, watches the other two more experienced mages for a hint of what to do. Magic, of course, but which spell? Well, they were looking for a person, so...
She closes her eyes and attunes herself to subtler senses. At first she is aware of only herself. then she can see delicate lines radiating from the point of light she's become. These lines connect her to other points of light, which are in turn connected to still more. Looking at the Tapestry, or the Green, too long still made Thessalt dizzy, but she'd managed to make it come up at least. Concentrating on this vision; this map of the intricate web of life, she searches for a hint of Asimov's presence.
(Using Sense Life, not a rote. 5 dice. No mana as I understand it, cuz it uses one of my favored arcanum. Keyed to search for human life only.)