Is there something with the last part that makes the player die instantly?

The damages are set to 15 but it does max damage. Please help.

local function WaitForChild(parent, childName)
	while not parent:FindFirstChild(childName) do parent.ChildAdded:wait() end
	return parent[childName]
end


local SLASH_DAMAGE = 15
local DOWNSTAB_DAMAGE = 15
local THROWING_DAMAGE = 15
local HOLD_TO_THROW_TIME = 0.38


local Damage = 15

local MyHumanoid = nil
local MyTorso = nil
local MyCharacter = nil
local MyPlayer = nil

local Tool = script.Parent
local Handle = WaitForChild(Tool, 'Handle')

local BlowConnection
local Button1DownConnection
local Button1UpConnection

local PlayStabPunch
local PlayDownStab
local PlayThrow
local PlayThrowCharge

local IconUrl = Tool.TextureId  -- URL to the weapon knife icon asset

local DebrisService = game:GetService('Debris')
local PlayersService = game:GetService('Players')

local SlashSound

local HitPlayers = {}

local LeftButtonDownTime = nil

local Attacking = false

function Blow(hit)
	if Attacking then
		BlowDamage(hit, Damage)
	end
end

function BlowDamage(hit, damage)
	local humanoid = hit.Parent:FindFirstChild('Humanoid')
	local player = PlayersService:GetPlayerFromCharacter(hit.Parent)
	if humanoid ~= nil and MyHumanoid ~= nil and humanoid ~= MyHumanoid then
		if not MyPlayer.Neutral then 		
			-- Ignore teammates hit
			if player and player ~= MyPlayer and player.TeamColor == MyPlayer.TeamColor then
				return
			end
		end
		-- final check, make sure weapon is in-hand
		local rightArm = MyCharacter:FindFirstChild('Right Arm')
		if (rightArm ~= nil) then
			-- Check if the weld exists between the hand and the weapon
			local joint = rightArm:FindFirstChild('RightGrip')
			if (joint ~= nil and (joint.Part0 == Handle or joint.Part1 == Handle)) then
				-- Make sure you only hit them once per swing
					TagHumanoid(humanoid, MyPlayer)
					print("Sending " .. damage)				
					
					local checksound = humanoid.Parent:findFirstChild("Sound")
					if checksound == nil then
					local givesound = script.Parent.Sound:clone()
					givesound.Parent = humanoid.Parent
					givesound.Disabled = false
					else
					checksound:remove()
					local givesound = script.Parent.Sound:clone()
					givesound.Parent = humanoid.Parent
					givesound.Disabled = false
					end
					wait()
					humanoid:TakeDamage(humanoid.MaxHealth)
					if humanoid.Health == math.huge or humanoid.MaxHealth == math.huge then
						humanoid.Parent:BreakJoints()
					end
				end
		end
	end
end