There is no way to compensate or punish someone for murder, it simply means forfeiture of one's own life.

谋杀者没有办法补偿或者受罚，只能以自己的生命为代价。

耶鲁公开课 - 旧约导论课程节选

So, you reinforce the pig for walking forward and you punish the pig for walking backward.

那你就对这头猪向前走的行为给予强化,如果它向后退，你就惩罚它。

耶鲁公开课 - 心理学导论课程节选