How to make this ONLY attack NPC's? [UNANSWERED]

It's part of the shadescript, by Stickmasterluke.

function attack(time,attackpos)
    if time-lastattack>=1 then
        local hit,pos=raycast(Torso.Position,(attackpos-Torso.Position).unit,attackrange)
        if hit and hit.Parent~=nil and hit.Parent.Name~=sp.Name then
            local h=hit.Parent:FindFirstChild("Humanoid")
            if h then
                local creator=sp:FindFirstChild("creator")
                if creator then
                    if creator.Value~=nil then
                        if creator.Value~=game.Players:GetPlayerFromCharacter(h.Parent) then
                            for i,oldtag in ipairs(h:GetChildren()) do
                                if oldtag.Name=="creator" then
                                    oldtag:remove()
                                end
                            end
                            creator:clone().Parent=h
                        else
                            return
                        end
                    end
                end