Hmm…Dio would be the one who would tell people very clearly not to panic but would be doing the exact thing he tells them not to do, Cal would probably be stabbing people and swearing, Amari would be distraught and probably wanting to bite someone, Hamish and Co would be sharpening their weapons and singing war songs, Ben would also be somewhat distraught (I think) and Nauvoo would probably be the only one acting calm but he’d secretly be very angry.