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It also the limit of depth/range of the gaan/tan away from the body.

There must be plenty of video footage of PB on youtube now that includes use of kwan sao? You can just 'talk' us through a few seconds.

How long is your piece of string for tying up then? :p

One term is not going to tell me how it's applied in combat.

My 'go to' Chinese online dictionary has this for 'kwan':

http://humanum.arts.cuhk.edu.hk/Lexis/lexi-can/search.php?q=%AE%B9

捆: tie up; bind, truss up; bundle

That is no more enlightening...

In simple words:

Outside of chi sau, in general, what does kwan sau work against, what should it achieve as an end result and what is the mechanics behind it?