Destroying a specific object

Getting Started Newbie Questions
#1

So guys, basically i want to destroy the ORC object when he hits the Fire:

This is what a have:

-- Function that detects collision beetween Orc and Fire local function fireCollision(self, event) &nbsp; &nbsp; &nbsp; &nbsp; if event.phase == "began" then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if event.target.type == "fire" and event.other.type == "floor" then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; self:removeSelf() &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; elseif event.target.type == "fire" and event.other.type == "fire" then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; self:removeSelf() &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; elseif event.target.type == "fire" and event.other.type == "orc" then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; orchealth = orchealth - math.random(40, 101) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if orchealth \< 0 then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; killOrc() &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; end &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print(orchealth) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; end &nbsp; &nbsp; &nbsp; &nbsp; end &nbsp; &nbsp; end &nbsp;

And this is the function that kill/destroy the object 

 local function killOrc(obj) obj = event.other.type obj:removeSelf() print(obj) end

I’m not sure how to by specific about what object should be destroyed.

#2

Why not killOrc(event.other)? (or self, I’m not sure what that function is connected to)

#3

Why not killOrc(event.other)? (or self, I’m not sure what that function is connected to)