Caesar fails his charisma check, to the surprise of no one that knows him. The moment he feels Zaknafein tense underneath his hand, a gesture that the drow had used to reassure him a moment ago, Caesar knows he's messed up. He steps back, eyes widening for a moment, seeing Zak's hand go to his sword. And then he looks down to the device in his hand, following Zak's gaze.

Then, he glances back up at Zak, doing his most reassuring voice. "... I'm not going to hurt you. I promise. Zak, it's okay."

Caesar hesitates, then turns the device around in his hands to point to himself, movements slowly, keeping his eye on Zak as if asking permission to continue. He would be more worried about his own safety, but the sooner he gets the scan in to calibrate the system, the better. He'll worry about his own safety later. The elf did just reassure him.

"Please?" Caesar keeps his words simpler; the fewer, the better Zak might be able to figure some out.