(3) A person who intentionally and unlawfully—
(a) chokes, suffocates or strangles another person so as to render that person insensible or unconscious or, by any other means, renders another person insensible or unconscious; or
is guilty of an offence punishable, on conviction, by imprisonment for 10 years.
(4) A person who does an act referred to in subsection (3)—
(a) intending to commit an indictable offence against this Part punishable by imprisonment for a maximum period exceeding 10 years; or
(b) intending to prevent or hinder his or her lawful apprehension or detention or that of another person; or
(c) intending to prevent or hinder a police officer from lawfully investigating an act or matter that reasonably calls for investigation by the officer;
is guilty of an offence punishable, on conviction, by imprisonment for 15 years.