Don't know how you'll be formatting the section on the SF bosses (HHH, Monoculus, Skeleton King), so here's the breakdown:

Contents

Starting from round restart, there is a 42 second delay before a boss is chosen to spawn.
The map then waits another 2 minutes and 26 seconds before spawning another boss.

Chances for each boss to spawn:

HHH and Monoculus will always spawn from the next available red point.
- For point 4 (the hatch), Monoculus will spawn from the hatch while HHH will spawn in the dirt courtyard next to the extremely long death hellhole.
Monoculus has his normal lifetime of 60 seconds.

The Skeleton King will always spawn at point 2.
9 skeletons will spawn in various points around the map.
All skeletons (king included) have a lifetime of 130 seconds.
Skeletons that are split into smaller skeletons will live for a few seconds longer after their 130 seconds has expired.

Every two boss spawns:

Lightning will shoot out from the clock tower and strike around the map.
The ground will quake.
The map attempts to run the mapevent horde. However, mapevents are typically coded to only accept input from specific maps (i.e. Helltower), and as such the event appears to actually do nothing gameplay wise.

While Monoculus and the Skeleton King have timers attached to their lifetime (60s and 130s respectively), HHH has no timer attached to his life. It is theoretically possible to have multiple HHHs active in the map at once, and to have other bosses active while HHH is alive.
If a skeleton attempts to path through the bomb cart, they will instantly die and not spawn mini skeletons.
HHH is able to clip through closed doors, due to what appears to be faulty navigation handling. If HHH becomes stuck (say, wedged against a closed door), the game will resolve the issue by teleporting him in the direction of his target.
HHH will attack any npcs that are active, including Monoculus and other HHHs.

That's everything I believe could be useful.

Topic on Talk:Bloodwater