A broken neck wasn't supposed to happen. She might not be able to point him to the Queen now.

There's a strong temptation to take the spear in the throat to watch people's reactions. (It's tactical! He'd get to find out who can see through his invisibility!) But it could be enchanted, and he has places to be anyway. Now that there's nothing directly in his way, he taps zinc and steel to casually walk through the crowd of suddenly frozen fairies. Whoever's holding on to his captive can let go or be dragged along.

Unless there's some kind of obstruction he can't see to avoid, he'll be as far as he knows to go in practically no time at all.