Eddy

There was a flash. The basement was full of sparks; like a rave, but with fewer drugs and slightly more chance of someone calling the cops.

"Once I've perfected the machine," Grigor said, "I'll go back and save her. I'll change history!"

"But then you'd have no impetus to ever create the machine," I pointed out, "so you would never have been able to save her... so she'll die, and you'll invent the machine..." I paused to think. He pushed a button and something whirred to crackling life. "Do you ever get déjà vu?" I asked.

There was a flash...