9. By way of preliminary to his principal contention that his client is protected by cl.6, Mr Bennett Q.C. for the appellant, submits that the negligence of the appellant in leaving the respondent exposed to the risk of loss on the coffee and silver contracts was a negligent performance by the appellant of its contract with the respondent and of its instructions. It was, he says, an error of omission, not of commission. He points to an acknowledgment in evidence by Mr Dimasi that the opening and closing of matching positions, apparently even on the same day, could not necessarily be achieved without some risk of loss and that day trading involved a risk of loss, albeit small. The instruction to avoid losses at all costs on closing out was therefore subject to these risks. Mr Bennett argues that the longer exposure of the respondent's risk in the case of the coffee and silver contracts was but a larger instance of the risks already mentioned and of the breaches of contract consisting of the omission to dispose of one of the two matching contracts at the time of closing. On this argument, the essence of the appellant's breach of contract was the failure to unlock the straddle by taking the final step to complete the process. A competing view of what happened, that adopted by the Full Court, is that Mr Kleemann deliberately disregarded his instructions to limit exposure to day trading and decided to subject the client to longer exposure, in the hope of reducing a loss or making a profit. Mr Bennett submits that there is no evidence to support such an inference and that the evidence shows that in all relevant transactions the market immediately moved against Mr Kleemann and deteriorated during the period of exposure. Although the primary judge was not satisfied that Mr Kleemann was deliberately defying his instructions, the Full Court thought that deliberate defiance of those instructions was the proper, if not the inevitable, inference to be drawn from the evidence.