гениальнейшее объяснение времён...я кажется влюбился в это существо по уши...такое создать!

"To say one:

"I will take over the world" - badass villain, the action is intended as certain
"I am going to take over the world" - careful villain, this is more about 'having the intention' to do something; still holds a certain strength
"When I will have taken over the world" - overconfident villain, the action is not only already granted, we're talking about a time which is after a future action
"It's impossible! I killed you!" - practical villain, referring to the very moment of the presumed 'killing'
"It's impossible! I had killed you!" - nostalgic villain, he refers to the past time which came AFTER the presumed killing; that is, back then, after 'killing' you... remembrance of a sweet illusion... kinda of a future in the past
"It's impossible! I was killing you!" - cruel villain. He likes to inflict slow and painful deaths, so his 'killing' is a CONTINUED action, not an instantaneous one. Therefore, he refers to the time of that action with past continuous. Clearly the hero has just revealed to him that, back then, not only he wasn't being killed, he even managed to do something else to spoil the villain's evil plans. Something serious is going on...
"I KILL YOU!" - angry villain. He is killing you. NOW. "