Boyle is right in front of the crease when the puck is turned over. Burns is a step or two in front of the blue line. How is that 5 ft? Go watch the video. I posted it on the last page. They might be 5 ft apart when they hit their own blue line, but by that point Kopitar was already past them both.
Boyle got caught too far up ice to recover. Burns should have recognized that.
This isn't that complicated.
They were 5 ft apart at the kings blue line, which at that point kopitar was behind burns but maybe just a little bit ahead of boyle . Biyle then starts watching the puck carry and drifting over into irwins side of the ice. Which at that point already had irwin and burns blocking off the puck carrier. Boyles job at that point is skate back as hard as possible and get back into his own position, not stop skating until the last moment after the puck was passed.