Let’s assume that Sally is not initially required to rescue Jimmy at the cost of one of her fingers. However, some writers argue that Sally’s failure to discharge her duty to rescue Jimmy at a low cost to herself renders her morally responsible for his current predicament. This responsibility renders her liable to bear considerably greater costs for Jimmy’s sake (such as the loss of a finger), and Jimmy (as well as third-parties) may impose the costs of rescue on her (Barry &amp; Øverland 2016: Ch.3; Barry 2018: 649; Tadros 2014a: 365. For the contrary view, that liability for failing to discharge a duty is restricted to the cost required by the initial duty, see Haque 2017: 70–71).