Add numerical building health to the corner HUD

I have hundred of hours play time with the Spy mostly using the classic knife and I was really interested to try the Conniver's Kunai as soon as it has been released.

Unfortunately, the 60 health points limit is really low and with the high level of missiles, pipes and bullets spam that there is in Team Fortress 2 it is really difficult to sneak behind the enemy lines without accidentally dying.

In the end I tested the Conniver a lot and found only a few maps and situations where its efficiency (K/D-ratio) is comparable to the standard knife. These are usually large maps, like, for example, pl_badwater (red team), cp_badlands and cp_coldfront when you are pushed by enemy team and mostly defending.

Here's my suggestion, based on the actual circumstances that earned me the Specialist achievement.

Play defense on pl_badwater. Make sure your team has a few competent damage sponges (Heavies, Soldiers, and Demomen) who know how to retreat (you may need to explain that bullets are hazardous to your health).

You want to stay alive. You can facilitate this by always sticking to a buddy. The best buddies to stick to are the ones that hang around sharp corners near narrow corridors:

In these locations, you and your buddy can stay behind cover in the yellow area, and once they are fully healed (to 150%, conditions permitting), they can venture into the red zone for ideal damage exchange along the highlighted lines of sight (where Heavies, Soldiers, and Demomen have a captive audience, so to speak, of the cart's escorts).

Note that the general advice here (be on a good team, play against a bad team, heal everybody) still applies, and that you'll still need classes like Engineers (who can help by putting dispensers near you) to cover your back.