Well my fleet manager once said to me "I would like to see the principle of the SOP obeyed if not the letter". If the principle of the 30 minute rule is to allow for 'visual maneouvreing below MSA in the case of an engine failure on departure', and it can be demonstrated that the commander did allow sufficient time for this then why would an authority prosecute for not observing an arbitary limit that took no account of the actual conditions?