I perused the decompiled MvM maps recently and noticed some stuff I find confusing. Mannhattan has a large trigger_hurt that does 0 damage above the grinder. What's its purpose? Most of the deathpits are filled with four triggers (in this order): func_flagdetectionzone, func_respawnflag, trigger_hurt (1,000,000dmg), and trigger_multiple (!activator.SetHealth(0)). The purpose of the first three are self-evident, but why the fourth one? Why do all the bombpit explosions use !activator.SetHealth(-1000) instead of a trigger_hurt?