Conditional effects on weapons question

Now, I'm a bit confused.. and forgive me if I couldnt find a thing through search.

I just was thinking and wondered which way the conditional effects on weapons works.

IE: Damage +15% when health is below 50%

The real question:
Does it add +15% when YOUR health is below 50% or when THEIR health is below 50%? Etc etc as applies to the different conditions

When your health is below 50%.

Well now that just sucks for hexed conditionals. However it DOES provide for what could very easily be a new conditional for weapons should Anet get a whif of it.

Thanks, ice.