I think this young man's speech is why Yanukovich fled. I saw it as it happened on TV. My Ukrainian bites (gotta do something about that), but he stood on stage at Maidan and condemned the bogus agreement brokered by Eurocrats and Opposition.
But then he said they'd be coming for the President, armed, if he didn't resign by the following morning. Yanukovich fled Kyiv that night.
I'm not sure if this speech was the trigger that led to Yanukovich's speedy departure, but it captured the spirit of the Maidan that night.