While at Division, Nikita was tasked with killing an assassin, Ramon. Instead of killing him, she took him alive and this came back to bite her.
Michael and Nikita set out to find, capture and turn in Ramon to the authorities.
It turns out that Percy paralyzed Ramon and used him to take the blame for Division assassinations.
Amanda wanted Ramon eliminated since his cover was blown. She threatened Michael's life to get Nikita to cooperate, but Nikita decided try and save Michael herself.
Ramon saved Michael's life by telling him how to escape just before Amanda blew up the house.
Nikita thought that Michael was dead.
Amanda tasked Alex with assassinating Anton Kochenko, who was one of the people responsible for her family's execution.
When Ramon's video was released early by Nikita, Amanda calls off the hit, but Alex pulled the trigger anyway.