「Stream of emissions from erection plum」(that's the part on the end that resembles a plum) needs no explanation, most likely, as one means of obtaining forgiveness by generating that stream.
　While some scholars feel these elements together (「red and head whacking, or, rod again and again with head of rod whacking, stroking」) suggest foregoing a beating, it seems that the PARDON, FORGIVENESS comes after the beating has begun and perhaps anger subsides for some reason, such as the death of the victim (「grave, tomb, plum pulp with stream of emissions」).「Red」is associated with rage, beaten skin, and blood. Modern usage indicates the punishment has begun but not fully administered, maybe from the idea that blood was drawn while beating the person, so that the beating stopped abruptly and then a PARDON, FORGIVENESS, AMNESTY followed. Then again, a PARDON or FORGIVENESS might only be extended after the subject has been「beaten and whacked until a bloody red pulp of unmoving but still living flesh」having received full punishment…many species of plums contain BLOOD-RED PULP and plenty of juice, appearing very similar to human flesh that has been split open by a rod strike.
　Summary of dynastic China legal philosophy:「'Only an intelligent ruler is capable of applying heavy punishments to light offenses. If light offenses carry heavy punishments, one can imagine what will be done against a serious offense. Thus, the people will not dare to break the laws.'…Trials and Chinese courts of law are conducted by torture. …During the course of the trial, the prisoner is asked a great many leading questions which have a tendency to criminate him. Should his answer be evasive, torture is at once resorted to…' The form of torture is to wind and twist the arms around a pole whilst the accused is beaten, with the torture increasing in the event that the accused 'persists in declaring his innocence.'」
　　[　https://prezi.com/ju1nonzljpiu/the-beginning-of-legalism/ 2023-05-17　]　

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Chinese: to pardon (a convict)
Japanese: pardon, forgiveness, exemption, permission, to permit, to allow, to approve, to tolerate, to exempt, to excuse, to pardon, to forgive, to release, to let off, to confide in, to give up, to yield
Unihan extended: forgive, remit, pardon
EDRDG: pardon; forgiveness