How can i make players knock back when i use a move?

Here when i use the move i want it to get knocked back and ragdoll

https://gyazo.com/acf350d1874168447515c083d7a8d832

and second question how can i make it shrin or grow bigger

heres the script, its not local its normal script

	local rp = game:GetService("ReplicatedStorage")
local SBomb = rp:WaitForChild("SBomb")

local Debris = game:GetService("Debris")
SBomb.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(0.7)

local SpiritBomb = script.SpiritBomb:Clone()
SpiritBomb.CFrame = Character:WaitForChild("UpperTorso").CFrame
SpiritBomb.Orientation = Character:WaitForChild("HumanoidRootPart").Orientation
SpiritBomb.Parent = workspace
Debris:AddItem(SpiritBomb,1)--How long until it disappears

local Vel = Instance.new("BodyVelocity",SpiritBomb)
Vel.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
Vel.Velocity = Character:WaitForChild("HumanoidRootPart").CFrame.lookVector * 0

SpiritBomb.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 then
				wait(1)
				SpiritBomb:Destroy()
			

				Humanoid:TakeDamage(1)

				end
			end
		end
	end)
	SBomb:FireClient(Player)
end)