Ways to kill The Silo Door scientist in Half Life 1! (DISCLAIMER IN DESCRIPTION)

WARNING! If you are squeamish, THEN PLEASE DONT WATCH THIS! This is also in garry's mod, and if you wanna know how to play hl1 in garry's mod, you will need the Half-Life Resized Maps addon. I am also using the Half Life Emplacements mod, and if you wanna use that, you're gonna need the Half Life 1 Weapons addon.