[QUESTION] Lua Differences

I've been messing around with a lua files a little bit and I've noticed that some server files have an alternative version(2011 edited, instead of 2009) of 116 and 117.

116 (2009)

Spoiler

Code:

-- //////////////////////////////////////////////////////////////////////
-- Caelum Sacra 2nd Boss_Alter Ego Mechanisms Before Summoning Monsters_ID-2470 AI 117.Lua  ver.090113
-- //////////////////////////////////////////////////////////////////////



-- //////////////////////////////////////////////////////////////////////

Mob = LuaMob(CMob)

-- //////////////////////////////////////////////////////////////////
-- User variables are declared here.

dwNextCreateTime = 0
bMobSay	= 0
bMobCreate = 0

-- //////////////////////////////////////////////////////////////////
-- User functions are declared here.



-- //////////////////////////////////////////////////////////////////
function Init()

end

-- //////////////////////////////////////////////////////////////////
function OnAttacked( dwTime, dwCharID )

end

-- //////////////////////////////////////////////////////////////////
function OnAttackable( dwTime, dwCharID )

end

-- //////////////////////////////////////////////////////////////////
function OnNormalReset( dwTime )

end

-- //////////////////////////////////////////////////////////////////
function OnDeath( dwTime, dwAttackedCount )

end

-- //////////////////////////////////////////////////////////////////
function OnReturnHome( dwTime, dwAttackedCount )

end

-- //////////////////////////////////////////////////////////////////
function OnMoveEnd( dwTime )

end

--   //////////////////////////////////////////////////////////////////
function WhileCombat( dwTime, dwHPPercent, dwAttackedCount )

-- When the HP reaches 50%, send a message and summon a monster 1 second later
	if ( dwHPPercent <= 50 ) then
		if ( bMobSay == 0 ) then
		-- Monster generation time is 1 sec after message output
		dwNextCreateTime = dwTime + 1000
		-- Message output 
		Mob:LuaSayByIndex ( 6403, 200.0 )
		bMobSay = bMobSay + 1
		end
		if ( dwTime >= dwNextCreateTime ) and ( bMobCreate == 0 ) then
		-- Summons 2 monsters
		Mob:LuaCreateMob ( 2472, 1, 0.0, 0.0 )
		Mob:LuaCreateMob ( 2473, 2, 0.0, 0.0 )

		bMobCreate = bMobCreate + 1
		end
		if ( bMobCreate >= 1 ) then
			Mob:LuaDeleteMob ( 2470, 1, 0.0, 0.0)
		end
	end
end

117 (2009)

Spoiler

Now on the 2011 edited version of these lua files you can see that the difference is in this little bit of code

116 (2011)

Spoiler

117 (2011)

Spoiler

I'm guessing the purpose of the added if statement for the modified 116 version is for error checking, so I brushed that off. However, I can't seem to find out why they changed the values passed into the LuaDeleteMob from:

Code:

Mob:LuaDeleteMob ( 2470, 1, 0.0, 0.0)

Code:

Mob:LuaDeleteMob ( 2470, 0, 0.0, 0.0, 500.0)

I checked Nubness' Lua post but it doesn't give any insight into what parameter it accepts. However, it seems like it was changed in other versions of the ps_game.exe? Does the last parameter in the new code represent a radius? Wondering if anyone has any input in this.