Touched event only works on one part at a time?

This is in a local script

--//Variables
local player = game.Players.LocalPlayer
local character = player.Character
local humanoid = character:WaitForChild("Humanoid")
local rightArm = character:WaitForChild("RightLowerArm")
local userInputService = game:GetService("UserInputService")

--//Debounces
local debounce = false
local debounce2 = false

--//Animation
local animation = Instance.new("Animation")
animation.AnimationId = "http://www.roblox.com/asset/?id=2637322749"
local loadAnimation = humanoid:LoadAnimation(animation)

--//InputBegan
userInputService.InputBegan:Connect(function(input)
    if input.KeyCode == Enum.KeyCode.Q and not debounce then
        debounce = true
        loadAnimation:Play()
        wait(1)
        debounce = false
    end
end)

--//TouchedEvent
rightArm.Touched:Connect(function(hit)
    if debounce and hit.Parent:FindFirstChild("Humanoid") and not debounce2 then
        debounce2 = true
        hit.Parent.Humanoid:TakeDamage(15)
        wait(1)
        debounce2 = false
    end
end)

What i'm trying to do is make a punching script that can hit multiple players at once but using the touched event only allows me to hit one at a time as you can see here,

https://gyazo.com/ed58afe2cfca5c3e808307c5669e25a1

The arm is touching both dummies but it randomly chooses the closest one.