"Stealth". Jack had heard this term used many times before. The way he understands it, it means moving unseen... Which is a truly confusing thing for one who walks the shadows themselves. Literally. From the dark corners where light did not reach, he watched as the Black Dragon fumbled with her device. He watched as the Demon crept in and joined her, and even saw the Slinger creep around and sink his teeth in some unsuspecting, but not less horrified, victim. Jack saw this all, for he was everywhere and nowhere. He was where the light could not reach, or where it was blocked by physical objects. This is how he moved, and observed.
The time he had spent with humans and other supernatural beings, he had learned that they do not always realize his pressence. Therefore he decided to whisper to the Black Dragon and the Demon from the shadows around them. [i]"I am here."[/i] he whispered to them, a calm deep and lingering voice that seemed to not originate from anywhere but rather manifest in one's mind. This is how Jack communicated.
Overlooking the situation one more time, Jack realized he did not know how the others would want to proceed with the situation. With the same horrible whisper (he didn't know better, he didn't really understand that the others would find it creepy or otherwise unnerving) he spoke again to the others present. [i]"I am ready. How shall we proceed?"[/i] he whispered, awaiting direction rather than take action himself, like Slinger had.