How do proxy_module response buffering options work?

[Hongli Lai]

Maxim Dounin wrote in post #994788:
> Busy buffers are buffers which are already passed downstream but
> not yet completely send (and hence can't be reused).  The
> proxy_busy_buffers_size directive limits maximum total size of
> such buffers and thus allows remaining buffers to be used to read
> upstream response (and spool it to disk if needed).

How can this be? Isn't there only a single buffer at any time that's 
only partially passed downstream?

The proxy buffers are per request, not global, right?

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