Wait who is Space Guy or whatever? Didn't he make slayer?
Space Guy was the programmer you went to when you wanted to make really loving fancy, never before done stuff in BL, and have it done as efficiently and as properly as possible. Although most of his add-ons have faded out of existence, you can still see his work used today in Support_Raycasting, Critical Hits, TF2 cloack knifes, Support_AmmoGuns, and other various weapon related support stuff. Also if you have his client sided wrench gui edit.