Board Thread:Show-Related Questions and Answers/@comment-25926288-20160219214913/@comment-24183764-20160219221827

What I believe happens is that for things like August's leg, the door the Apprentice summmons and probably even glamor spells the people who don't believe subconciously filter out the magical properties just like how Emma saw August's leg as a normal leg.

However with things like fireballs and teleportation where the brain can't come up with an excuse the person is forced to see it whether they believe it or not.