[He stares at the seed in the hologram. He reaches out and moves his hand before it, noting the side of it compared to his hand.]

Do they have a distinctive scent? [Someone might have the tools he no longer has. But even if they don’t when he can change again he could be aware of this and track them down. Maybe.]

Do they do anything else that could help give them away? Temperature changes. A change in the air itself. Boosting or lowering of magic? Something that could hint we are close.