There is no fake saint (that we know of currently). We have
ex-saint Iris and,
current saint Ezekiel.
"Fake saint" is just an insult Ezekiel uses for Iris. She's not actually fake.
Oof, filler. Suspension of disbelief is getting harder to maintain...
The mangaka should really learn how to use speedlines and smears to represent movement.
No, it doesn't. Not here at least. That was added later in the tankoubon.
But even if it wasn't imagination, aren't people aware that a love triangle is a basic element of romance stories?