Exactly. David didn't defeat Goliath: God did. But God waited for someone who knew who He was to walk out onto that field. And David needed to understand that Goliath wasn't insulting or fighting him, but God. That's why he said, "Who is this heathen Philistine to insult the living God?"

I kind of feel this might be a similar situation. Knowing the giant should put it in perspective.