Boba does not go anywhere... The space junk is spinning around the falcon is moving off in the cockpit shot. or Boba has slowed to the same speed as the junk on the outer edge.

This infers Boba has stopped within the bounds of the junk field to remain hidden.

What ever else he does happens off screen and rightly so.

I like the idea of the extra distance but it further accentuates why Boba is weirdly not detected.

In the original he is right on the falcons ass possibly so close he is out of range of detection what with all the junk debris also.

There is also a lot more skill in that manouvre he pulls of the close pursuit than the skulking far behind.

I'd say Slave 1 is at a dead stop more or less in the cockpit shot so Boba is able to do an accurate calcultaion... This is a fault on the film makers part for not conveying this change via sound or visually expressing Slave 1 coming to a halt.