Very little could have thrown Lan Wangji off course at this moment, but Claudius has stumbled upon one of the few things that could have. He frowns, and stops, and bestows a look of concern on his friend. "I should have asked how you fared under the spell when apart from me," he says. He is momentarily ashamed not to have thought of that, of Claudius' own secret and the painstaking care with which it was handed to him.