Remember the Half-Life 2 zombies' shrieks of pain and sheer horror whenever they were set alight? Black Mesa managed to make them sound ''worse'' and ''more zombie-like''.
Or, if you truly want to bring back the Narm, you can do things like this. note For the squeamish, however, the scene's dramatic effect also works against it, since you can just smash the door with a chair and hightail it up the ladder before it falls the elevator will still "crash" but the scientists inside will emerge unharmed. Of particular note is that one of the scientists killed is now a woman, which makes the scientists' screams as they fall all the more gut-wrenching. What was once a relatively Narmy scene in the original Half-Life is now horrifyingly realistic in its portrayal.
Good gravy, the falling elevator in "Unforeseen Consequences".
A special mention goes out to the encounter in Office Complex, where he appears behind a door no more than 3 yards away from the player.
The G-Man encounters are more disturbing in Source, due to his more detailed model and the retention of the original engine's short distance between him and the player.
The victims skull is torn open and the upper half is missing, and the brain is visible, and the skin is mottled, gray and decomposing.
Shooting a zombie so the headcrab flies off reveals that what the headcrab does to its poor victim is nothing short of horrifying while Half-Life 2 and its expansions toned down the horror and just had a regular civilian model with their face in rictus and matted hair beneath the headcrab, Black Mesa goes far, far beyond that.
One of the levels from Interloper ups it even further - as you make your way to the Nihilanth's base, you are forced to flee from not one, not two, but EIGHT of these monsters! They're pack animals!.
Which means aside from scripted events, they're completely invincible.
Unlike in the original Half-Life, they are also completely immune to explosions or Gluon energy.
If you scramble onto the tower to away from the one in "Surface Tension", it will try to shake you back off the tower by attacking it. If you watch it through the windows from the control room, it will pause every so often to glare back at you as it lumbers past. If you approach the door, it reaches in and tries to fry you with its flamethrowers. If it sees you, it camps at the door and waits for you to come out or leave. The one you meet in "Power Up" remembers where it last saw you exit the room, and it will check the doors as it patrols for you coming back.
If that doesn't get to you, their new Artificial Brilliance will.
If you thought that Gargantuas were scary in the original Half-Life 1, you'll be absolutely terrified by how they look now (see the page image).