"Tainted Blood" is the third memory (mission) in Sequence 12 in Assassin's Creed IV Black Flag
Takes place in Havana
Stay out of combat
Use 2 Guards as human shields
Locate Laureano Torres
Tail El Tiburon
Kill Loreano Torres
Kill El Tiburon
Escape the Area and Hide
Reach the Assassins' Bureau
Royal Misfortune
Ever A Splinter