[SQU] Why not quick abort?

I am using 2.2.STABLE5-hno.20000202.
In the squid.conf I set these:

half_closed_clients off
quick_abort_min -1 KB

Please take a look at attached HTML, the last file
descriptor 52 which keep download for long time and
it's client have already aborted for long time.

Why this happen? If more many file descripor like this,
could it cause bandwidth spike? How can I prevent this?

Thank you.

--
Li Ni
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