Follow up on why the thumb, and only one finger was acceptable for the lottery to be chosen to do terumat ha-deshen. Also, Revenge and holding a grudge are good, nay, necessary (!) for a Torah scholar. But that contradicts the verses in Leviticus, so the Gemara has to resolve this surprising statement. Including the Gemara's definitions of revenge and holding a grudge. Recognizing that people have different personalities and relate to this differently... There may be a difference between the default for the average Joe and that for the Torah scholar. Plus, a knife fight and death among the kohanim. With its comparison to the eglah arufah. Note the officially misplaced priorities, putting the laws of purity and impurity above (preventing) murder. Note also that being too lax or too stringent takes us far afield from what we're supposed to be doing.