[ Said wall can be everywhere she needs him to be, the "joy" behind being able to command him to her side. Not so much a good experience for him, but one that could save her life. ]

Simple? It's realistic.

Unless you're claiming that people here are incapable of dying. Please don't spread those kind of baseless rumors. Do you know how many reckless idiots we have here that would kill themselves off just to save another from breaking a limb?