How to make death metal grind black hardcore deathcore vocals

I made this video for a student i have in death metal vocals, where i discociate every kind of death metal vocals i know, i think they are all here if i forgot one tell me i ll try to put it but i would like to have some of your comments on it, what you like or dislike Give your point of view Of course don t take care about the predokills at the end ahahah i don t know how to make them Just enjoy my dummy face while i m singing ahahah Thanx Benito And if yo