If you have a lazy repo, darcs downloading patches from remote sources
can be somewhat unexpected. We should output a message once to warn
people this is happening.
http://irclog.perlgeek.de/darcs/2010-12-03#i_3054805 has a bit more
context.
I think this issue is related directly to the problem I reported recently
http://bugs.darcs.net/issue2123.
Darcs is not informing users about beginning network activity while
performing various commands on a --lazy repo.