But if punishment is risky or costly for C, she may not do much to A, making A feel unconstrained. But if C can punish A in a cheap and even enjoyable way, the threat to A may be more substantial.
但如果惩罚行为对C而言风险很高或代价很大，他可能不会对A大动干戈，于是A就会肆无忌惮。但如果C可以以低成本甚至随心所欲地惩罚A，那么A所受到的威胁就相当大了。