Luke came to a stop just outside of the reach of Anakin's lightsaber and looked at him, still radiating calm despite the roil of emotions coming from every other quarter. He couldn't let his father run off half-charged and angry--vengeance wasn't the right answer by far.

Closing his eyes, Luke searched inside himself and through the Force for the right words to use, for the way to persuade Anakin to calm down and come back to do what would really help Obi-Wan.

"I'm not here to fight you," he said simply. "If we duel here we'll only scare more people and cause a panic, and then more will be hurt. The being who did this to Obi-Wan is probably already captured."