How would I rotate a model to match a part's position?

The model is an NPC that needs to rotate/face a second NPC's position when the second NPC touches the first.

I've used this code down below, but it isn't entirely accurate and makes the model spin.

local model = script.Parent.Parent.Parent
script.Parent.Touched:Connect(function(hit)
    if hit.Parent.Name == "NPC"  then
        local position = model.HumanoidRootPart.CFrame
        local torso = hit.Parent.Torso
        model:SetPrimaryPartCFrame(position * (torso.CFrame - torso.Position))
    end
end)

Any help is appreciated.