Help me with a specific scare

[NyteMyre]

I decided to give the level-creator a try and it's been fun doing the layout so far. But now i'm at the part where scripting should be involved.

There's a specific scare that i wanted to implant ever since I started, but i have no idea how to start:

This is the idea:

Spoiler below!

The player is walking down a poorly lid hallway. The player shouldn't be able to see very far down the hallway and shouldnt be distracted by doors down the side.

When the player walks down the hallway, the lantern is suddenly out of oil (no matter how much oil is actually left in it) and dies out. The player should move on down the hallway without any light.

Suddenly, without warning or notice, a grunt comes running at the player from down the hallway and despawns when it reaches the player.... (which should be in its face).

Now for this to work, there are some points that i need some help with
- The monster should not make any sound when it appears. So no "screech", growling or start a music-track.
- He should still be able to produce sound when it runs at the player (footsteps)
- The player shouldn't get any insanity drop from when he sees the monster (although should be tested what works better)

Is this possible?