Where does an organisation stand if they take certain physical skills out of a physical restraint or defensive training programme (so that staff are no longer taught them) and then a member of staff gets injured during a restraint / assault at work that could have been prevented had the skill / or technique been left in? 

Could the company / training organisation be held liable for negligence under an act or omission for the injury sustained on the basis of the defendants claim that they were denied using a skill which, if applied correctly, in line with the training given and as part of a tactical hierarchy of response options, would have prevented the injury from being sustained?