He’s going to have to learn how to walk over that thing normally at some point.

Smaller sanctuaries often conceal their defenses to make their visitors feel at ease, while larger ones tend to be more interested in making sure their visitors remember that the acolytes within are perfectly capable of being unfriendly if they feel it’s necessary.  A sanctuary’s main function is, after all, to provide a place of safety for the god, and for its acolytes should it be large enough.  It is not a place of worship.