Who did that?
G-Line doesn't show who banned someone, and if you've ever staffed on a big network, you'll know that sometimes when you kill someone popular, you'll get 3-5 messages (or more) about it, some of them being quite hostile.
We now have an answer for this!
See http://www.inspircd.org/wiki/Configuration#hidekills
Thanks to HiroP and owine for the idea. :)