Post traumatic stress is one possibility. Maybe at the exact moment he was shunted in the time stream, there was a meteor with his name on it streaking directly towards him, and he had resigned himself to die. He could have a recurring nightmare about it and regularly wake up in night sweats right before the moment of impact. This could manifest as pyrophobia, where he's afraid of flames and fire based attacks, leading to anxiety and mistrust around thaumaturges and marauders (I think overpower, the marauder AoE threat attack, is depicted as a burst of flame).
I'm a tinker! Tinkerer? Hrm.... I'm an artificer! - Myxie Tryxle | Impressions and Memories
