Sure enough, the necklace is missing, but he doesn't get much time to do more than confirm that fact, before a sixth sense warns him of impending danger, allowing him to twist out of the way of a razor sharp blade, likely aimed at severing his spine in a single blow.<br/><br/>(16 to hit, 5 damage if it does, plus a DC 17 fort save, or be poisoned, taking 1 str damage.)