My ability keeps flinging me

Help and Feedback Scripting Support
#1 
local DebrisService = game:GetService("Debris")
local rp = game:GetService("ReplicatedStorage")
local Thunder1 = rp:WaitForChild("Thunder1")

local Debris = game:GetService("Debris")
local debounce = false

Thunder1.OnServerEvent:Connect(function(Player)
   
 
    local Character = Player.Character
    local Humanoid = Character:WaitForChild("Humanoid")
 
    --Here you can Add animations
    local Firing = Humanoid:LoadAnimation(script.Anim)
    Firing:Play()
    wait(1)
 
	
		
	local BV = Instance.new("BodyVelocity", Player.Character.HumanoidRootPart)
	BV.MaxForce = Vector3.new(math.huge, math.huge, math.huge)
	BV.Velocity = Player.Character.HumanoidRootPart.CFrame.LookVector*-200 -- This is how fast you will go in the air
	game.Debris:AddItem(BV, 0.1) -- this one deletes the velocity so you stop flying up
	 
	

	local Hitbox = script.Hitbox:Clone()
    Hitbox.CFrame = Character:WaitForChild("HumanoidRootPart").CFrame * CFrame.new(0,0,0) --This is where the fireball will spawn, so it can be UpperTorso, Left Hand, Right Hand, Head, Etc.
    Hitbox.Orientation = Character:WaitForChild("HumanoidRootPart").Orientation
		Hitbox.CanCollide = true
   
	local Weld = Instance.new("ManualWeld")
		Weld.Part0 = Hitbox
		Weld.Part1 = Character:WaitForChild("HumanoidRootPart")
		Weld.C0 = Hitbox.CFrame:inverse() * Character:WaitForChild("HumanoidRootPart").CFrame
	Weld.Parent = Hitbox 
	
	
	spawn(function()
   for i = 0, 1000 do
    wait()
    Hitbox.Size = Hitbox.Size + Vector3.new(0,0,0)
    end
  end)
    Hitbox.Parent = workspace
    Debris:AddItem(Hitbox,1)--How long until it disappears
 
    local Vel = Instance.new("BodyVelocity",Hitbox)
    Vel.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
    Vel.Velocity = Character:WaitForChild("HumanoidRootPart").CFrame.lookVector * 0 --Speed of Fire Ball
 
	Hitbox.Touched:Connect(function(Hit)
        if not Hit:IsDescendantOf(Character) then
            if Hit:IsA("Part") or Hit:IsA("MeshPart") then
                local Humanoid = Hit.Parent:FindFirstChild("Humanoid")
             
                if Humanoid and Humanoid.Health > 0 and debounce == false and not Humanoid:FindFirstChild("Attacker") and not Humanoid:FindFirstChild("Fireball") then
                    local Attacker = Instance.new("ObjectValue",Humanoid)
					Attacker.Name = "Attacker"
					Attacker.Value = Player
					DebrisService:AddItem(Attacker,3)  
                    local Hitbox = Instance.new("ObjectValue",Humanoid)
                    Hitbox.Name = "Hitbox"
                    DebrisService:AddItem(Hitbox,3)  
                    local creator = Instance.new("ObjectValue",Humanoid)
					creator.Name = "creator"
					creator.Value = Player
      Humanoid:TakeDamage(20)
    end
   end
  end
 end)
 wait(0.1)	
debounce = false
 Thunder1:FireClient(Player)
end)

My ability keeps on flinging how do i stop it from happening here is the local script

local Player = game:GetService("Players")

local rp = game:GetService("ReplicatedStorage")

local Thunder1 = rp:WaitForChild("Thunder1")

--KeyPresses and Inputs

local UIS = game:GetService("UserInputService")

local debounce = false

local cooldown = 10

script.Parent.Activated:Connect(function()

Thunder1:FireServer()

end)

Thunder1.OnClientEvent:Connect(function()

wait(cooldown)

debounce = true

end)