This if statement won't run?

So, I've made a script that checks an AI's health, and if the AI's health is below 700, it's supposed to switch his swords

I've ran the code in the command bar and it worked fine, but whenever I add it into a script, it doesn't execute the if statement (or at least that's what I'm guessing, because once I damage the AI past 700, it doesn't switch swords

It's in a script located inside Workspace

	if game.Workspace.AI.Sword.Humanoid.Health <= 700 then
		game.Workspace.AI.Sword.FireSword:Remove()
		game.Lighting.SecondSword:Clone().Parent = game.Workspace.AI.Sword
	end