Just read the case study and answer the question

Ervin set up a practical joke to be played on his roommate Johnson. He 6 points rigged a board on the front porch of their dwelling to swing up towards a person who steps on it. The letter-carrier was the first person to arrive. He stepped on the board, was struck in the face, fell backwards on the sidewalk, striking his head, which left him in a coma. Section 247 of the Criminal Code states: (1) Everyone who, with intent to cause death or bodily harm to persons, sets or places or causes to be set or placed a trap, device or other thing that is likely to cause death or bodily harm to person is guilty of an indictable offence and liable to imprisonment for a term not exceeding five years. Explain, in detail, using proper legal terminology (e.g. transferred malice), whether or not you feel Ervin should be found guilty of a crime. Include in your explanation what the Crown would have to prove to obtain a conviction. Also, what category of offence is section 247? Your