[He had a feeling that Kaveh wasn't going to be happy about all this, but at least he's agreed to be the bait here to get the ghosts to come out of their hiding spot. Tartaglia is expecting them to possess those cans next to Kaveh, and then try something, hoping that he'll be able to spot them mid-possession and move quickly before they can wreak any more havoc on any more people and themselves.

He watches the area around the cans carefully, not knowing that the ghosts have already hidden themselves where they can successfully possesses Kaveh instead of the cans, not realizing that in that split second, they've already taken his friend.

Though, he does find it strange that Kaveh suddenly stops like that, getting suspicious and walking forward to meet the architect. The Harbinger looks relaxed on the outside, but on the inside he's poised and ready to react to anything at all, battle senses at their height. The chill they'd felt is gone now, and that's suspicious too. He rattles the garbage cans a few times, not seeing anything...]

Strange. They couldn't of gotten far, and I can't sense them anymore. Perhaps they're lying in wait somewhere else. What do you think?

[He says that, his peripheral glued on Kaveh.]