Having pushed open a heavy door the team find themselves in a narrow corridor (at point A). They pass along it and find themselves at the end of a gloomy cavern. Coming out of the gloom towards them they see a row of beasts. And what's this? Another row behind those! Time to leave methinks.
Here's a map:

Use Core 1.0 rules. Bogies that are killed return to play at the back of the cavern.
Obviously the team players top priority is to get the team safely behind the door, but how many bogies can they kill before they leave? How long dare they stay?
Things to try:
1. I've based the dimensions of the cavern on the
chess board test but it's probably a good idea to try caverns of different lengths and widths. I've also guessed at what might be a good length for the corridor to you might want to try altering that too.
2. Try limiting the number of bogies who can come back into play on each turn and/or changing the total number of bogies allowed in play.