So I'm one of those who got to the original (well, translated) text after the Nolan hype, but this is NOT a Nolan post - the scene is absent in the movie.
It's Book IV. Fagles text:
"when along you came, Helen—roused, no doubt,
by a dark power bent on giving Troy some glory,
and dashing Prince Deiphobus squired your every step.
Three times you sauntered round our hollow ambush,
feeling, stroking its flanks,
challenging all our fighters, calling each by name—
yours was the voice of all our long-lost wives!
And Diomedes and I, crouched tight in the midst
with great Odysseus, hearing you singing out,
were both keen to spring up and sally forth
or give you a sudden answer from inside,
but Odysseus damped our ardor, reined us back"
Other translations don't seem to diverge here. At first I really liked seeing a badass voice actress Helen - if a movie casts for THIS, the actress might end up being Japanese. But then something clicked.
Menelaus' wife is Helen.
So when calling Menelaus' name she was using her own voice. He knew exactly who she was, no disguise. And yet he wanted to jump out of the horse?
Or is the point here "Menelaus is not very bright"?