wtf was that ending about? He grows skin of steel because he believes in it hard enough

and what was the resolution for the lead girl? She finally has the courage to shoot her new oppressor but it doesnt hurt him cause steel skin but then he sees these unexplained "abuse" scars on her and sees them as kindred spirits...i was enjoying the movie but the 3rd act was a fucking mess. was the movie seriously just a setup for mcavoy to be the villian in unbreakable 2 and a shayamalanverse
What a Shayamalan twist!
I hope he gets deported by Trump