In this case, passthru is still doing audits for outbound messages to the nhin since the delegate does audits as well (i.e. with this change, passthru has 2 audits outbound instead of 4).  We've been inconsistent with it on previous releases, but with LWGW, passthru is auditing (or supposed to) the same way as standard (4 on the requesting and 4 on the responding) with the idea that people can turn it off in the spring proxy config file.