He didn't say final act, he said final fight.
Here is the article:
But our final scene, our final battle â unlike a normal movie where the final fight scene is six minutes long, ours is 26 minutes long! So you get 26 minutes of two monsters pummelling each other through New York City, jumping up and down, ripping helicopters from the sky and stuff. You know, lots of green blood on the street, splashed all around. So its pretty cool.
Some humans try to get out of the way but no, they cant⦠theres a little bit of collateral damage! (Laughs) Theres a bit of a bodycount. Not on account of the Hulk - the Hulks a saviour - but Blomsky [Abomination] is ruthless.