Megatron kills Starscreams

Megatron corners Optimus and points his blaster at him, while welcoming Starscream and notes how thankful he is to be at his when he exacts his vengeance against the one who caused his 50 year downfall. Megatron did kill the one who caused his downfall, it was an enemy, but it wasn't Optimus, and it wasn't through his blaster as well.

Example of:
Blofeld Ploy