Nadia takes the innitiative

"What do you mean, you can't find them?" Mathew asked, more surprised than angry or scared.

'You knew where they were coming from, how fast they were approaching, and could keep tabs on them at all times,' the young man thought, accounting for every possible advantage that Norbert had when it came to surveillance. 'So how in all hells could he lose them?'

Mathew didn't direct his internal question at Norbert. A single look at the man's face was enough to confirm he was just as surprised as Mathew.

No, Mathew directed his question was the situation itself.

"It's impossible for me to lose their tracks," Norbert muttered, lowering his eyes and rubbing his chin. "It's more like…" he hesitated for a second before raising his eyes and opening them wide as he looked right at Mathew's face.

"I can no longer track them with my ghost form!"

'That's… a different explanation,' Mathew quickly figured out the meaning behind Norbert's words.