Now I know they are looping and reversing certain parts of the main vocals but the texture change of it is something else! It sounds like some strange pitching method combined with some specific type of distortion, kicks in at 0:53
https://www.youtube.com/watch?v=xwjwCFZpdns
Also you can hear the same thing on this one at 2:24
https://www.youtube.com/watch?v=FWR9MR5juWI
https://www.youtube.com/watch?v=xwjwCFZpdns
Also you can hear the same thing on this one at 2:24
https://www.youtube.com/watch?v=FWR9MR5juWI