In Need of Some Clarity

PD's unique passive Lament tells us that the last champion hit will deal 12% less damage to you. I have a few questions on the nature of this passive for the sake of clarity.

Example 1: Miss Fortune attacks champion A. Miss Fortune then attacks a minion to reset her passive. Champion A hits Sivir. Does the damage reduction apply?

Example 2a: Sivir throws her Q. Sivir auto attacks Champion A. Sivir's Q comes back and hits Champion B. Champion A attacks Sivir. Does the damage reduction apply?

Example 2b: Sivir throws her Q. Sivir auto attacks Champion A. Sivir's Q comes back and the boomerang is spell shielded by Champion B. Champion A attacks Sivir. Does the damage reduction apply?

Example 3: Ashe buys both PD and Runaan's. Her auto attack hits Champion A while Runaan's bolts hits Champion B immediately after. Champion A attacks Ashe. Does the damage reduction apply?

Example 4: Aatrox ignites Champion A. Champion A disengages from Aatrox. Champion B now engages Aatrox. Aatrox auto attacks Champion B. Ignite deals damage to champion A. Champion B attacks Aatrox. Does the damage reduction apply?

Example 5: Tryndamere has both PD and Thornmail. Tryndamere attacks Champion A. Champion B attacks Tryndamere and receives damage from Thornmail. Champion A attacks Tryndamere. Does the damage reduction apply?

Example 6: Jinx buys a Randuin's Omen to stop a fed Yasuo. Jinx uses Randuin's active in order to slow Yasuo. Yasuo is slowed. Yasuo attacks Jinx before she lands an auto. Does the damage reduction apply?

Example 7: Jhin and Deathfire Touch damage

Example 8: Corki and Liandry's burn damage

Example 9: Vayne and Blade of the Ruined King active damage

Example 10: Twitch's poison