how to give xp if 2 players attacked an NPC ?

i have a code that give a player 'xp' when he kill an npc, but if 2 players damage the npc only the player who killed the npc will take the 'xp', so i want a way to give the player who does the most damage to the npc to take the 'xp' can any one help ?

this is the NPC script:

local humaniod = script.Parent:WaitForChild("Humanoid")

humaniod.Died:Connect(function()
    game.ServerStorage.Give:Fire(5, humaniod.creator.Value)
end)

and this is the script in the ServerScriptService :

game.Players.PlayerAdded:connect(function(player)
    local info = Instance.new("Folder", player)
    info.Name = "playerInfo"

    local xp = Instance.new("IntValue",info)
    xp.Name = "XP"
    xp.Value = 0

    game.ServerStorage.Give.Event:Connect(function(xpAmount, plr)
        if plr.Name == player.Name then
            xp.Value = xp.Value + xpAmount
        end
    end)
end)