Im confused about the Phantom Dancer passive, can someone explain it to me?

"The last champion hit does 12% less damage to you (ends after 10 seconds of not hitting.)"
..what? Im confused, someone please help me! I appreciate it!

"The last champion hit does 12% less damage to you (ends after 10 seconds of not hitting.)"
..what? Im confused, someone please help me! I appreciate it!
"12% less damage to you"
when you auto someone they do 12% less damage to you, it lasts 10 seconds but can be reapplied by autoing again
You're missing the keyword of less. So they'll do 12% less damage to you, meaning if their attack would have done 100 damage to you normally, it'll only do 88.
so lets say you are playing fiora vs yasou ... both of you do damage .. its a duelist lane... if yasou has PD and he hits fiora with any damage ability or auto for the next 10 seconds she does 12% less damage to you ( its damage reduction , you take less damage from the person you last did damage to ) its meant to be a duelist item
If you build
and you auto someone, that person do less damage to u.