Board Thread:Off-Topic Fun/@comment-3127757-20130311172927/@comment-5106672-20140929231223

The fact it is canon does not mean it may not be a continuity error. Charmed, for one, was full of continuity errors that are considered canon (potions and spells that worked differently according to the needs of that week's episode, but still count as canon).

Walsh fits into the “passive” magic wielders: he was enchanted (= had a spell cast on him), not an enchanter (= cast a spell), and as I said, enchanted objects (and, apparently, people) carried over from magical realms retain their properties. So, thus far, the Dragon is the only unexplicable continuity error. 100% canon, but still diverging from the rest of the main sources.