it's called a spinhack. it's a quite obvious hack when the player gets instant headshots in 1 shot.
the upside down hack is called anti aim hack. its not suppose to help you aim its suppose to counter you from getting killed easier. so i'm kind of confused where this alleged use of upside down screen helps get headshots easier or for any reason at all... as far as anyone else is concerned unless there is a demo this never really happened.
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Got a blister? Ibuprofen. Can't feel from your waist down? Ibuprofen. Got a spider bite? Ibuprofen. - SPC S-Rod & Me