Stop getting score while the NPC is dead?

So I have a raycast weapon that can hit any humanoid and decrease it's health. It checks if the humanoid is at 0 health or below then sends a remote event to a server script then the server script gives the player score. I have a problem where the player can still attack the dead humanoid multiple times before it despawns thus getting a lot of points per kill.

Adding a timed debounce is not an option since the player will not be able to get rewards from killing other NPCs until the debounce is over.

Local script (Weapon):

if hit and hit.Parent:FindFirstChild("Humanoid") then
        if hit.Parent.Humanoid.Health <= 0 then

        remoteEvent:FireServer()
        end
    end

Server script:

local remoteEvent = game.ReplicatedStorage:WaitForChild("KillEvent")

remoteEvent.OnServerEvent:Connect(function(player, tagClone)
    local points = player:WaitForChild("leaderstats"):WaitForChild("Points")

    points.Value = points.Value + 1
end)