For criminal responsibility as an aider under s 7(c) of the Criminal Code (WA) in relation to an offence of unlawfully doing grievous bodily harm, the prosecution need only prove that the aider knew the victim was being, was about to be, or might be assaulted; it is unnecessary to prove the aider knew or expected the assault would be of a particular severity or have a particular result. A sentencing judge must not artificially segment a short, continuous altercation when assessing which acts constituted aiding. Ordinarily, immediate imprisonment is the only appropriate sentence for unlawfully doing grievous bodily harm committed in company in a public entertainment area, and the objective features of such offending will outweigh personal mitigating circumstances favouring suspension.
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