How to make NPC loose hp?

[whitevo]

Eeeh? Am I missing something?

print(npc:getHealth())
npc:addHealth(-1) -- doTargetCombatHealth(0, npc, PHYSICAL, 1, 1, 1) //doesn't work either
print(npc:getHealth())

console:
500
500

currently i created reverseHP for NPC.
So it visually looks like his taking damage and hp goes down, but there is no damage numbers.
So yeah, is there some kind of flag or something I'm missing?

 

[samco]

What if you do send text with the damage number?

 

[whitevo]

What if you do send text with the damage number?

it looks weird and that text lingers too long, looks better without.