Also, in canon, in book 7 the protagonists themselves use the Imperius themselves (as part of the break-in to Gringotts.) There we get the best look at the actual mechanics of the Imperius, including that we see Imperius commands being issued telepathically as it were, from the caster’s thoughts.
Also, in canon, in book 7 the protagonists themselves use the Imperius themselves (as part of the break-in to Gringotts.) There we get the best look at the actual mechanics of the Imperius, including that we see Imperius commands being issued telepathically as it were, from the caster’s thoughts.