Basicly you get arested by guards belonging to a realm that is on the other side of the continent
The priest of that realm, is in your capital, all alone. The realms are at war. So where are these guards coming from? Guards belonging to an enemy realm in your capital to be exact.
No noble is ever "all alone". Well, except an infiltrator off on an infiltration mission.
But even he, once he returns from his successful assassination or whatever, will have at least a small retinue: personal guards, scribes, stewards, etc.
Nobles just don't travel
alone. It's Not Done.