Time Nexus
And what he saw was a time nexus within this cave, a boiling of possibilities focused here, wherein the most minute action — the wink of an eye, a careless word, a misplaced grain of sand — moved a gigantic lever across the known universe. He saw violence with the outcome subject to so many variables that his slightest movement created vast shiftings in the pattern.
The vision made him want to freeze into immobility, but this, too, was action with its consequences.
Not in a duel yet
Source: Ace Special 25th Anniversary Edition, p296