This restores some unused visuals to the good ending for Black Mesa. To use, simply put this in the "custom" folder of your Black Mesa Steam directory. This is usually something like "D:\Steam\steamapps\common\Black Mesa\bms\custom", with whatever letter hard drive your steam is inatalled in substituting for D. The official map source files are in the Steam Workshop.
I don't know if it's because of all the other mods I have for this game, but the G-Man's lips don't move in that last sequence when I run this mod.
So sorry about this. I'd recommend looking to see if you have any conflicts.