In Highlander, the Kurgan sneak-attacks his victims several times.
He spies on Brenda and Connor when they visit the zoo. He was within 6 meters of Connor MacLeod at the zoo.
He sneak attacks Connor MacLeod after he leaves a bar to follow Brenda. He got to within a meter or two of MacLeod. He is close enough to be within striking distance.
He hides within the Silvercup Studio sign to sneak attack Connor MacLeod again. He is again close enough to be within striking distance.
This is at odds of immortals having a "radar-like awareness" of other immortals nearby.
Why do other immortals not sense the Kurgan when he was is close enough to kill them?