Makkot 20: Real (Jewish) Men Don't Shave (in Mourning)

Finishing out ma'aser sheni - determining when one would be subject to lashes if the produce is eaten outside of Jerusalem. That measure is derived from the proximity of verses in the Torah that align lashes with the phenomenon of eating outside of Jerusalem. Plus, the tithing of one fig that wasn't tithed - how does that work? Note how designating food for tithing might actually result in more lashes than if no designation had taken place. Also, a new mishnah -- on one who shaves his head or the like in mourning, which is prohibited. How is one held accountable, and for what actions, exactly?