[Hiccup certainly doesn't know they're indestructible; he's seen plenty of metal objects (iron, mostly) being melted into scrap by Changewing acid, so his initial thought is definitely a tiny bit of panic. He also doesn't want to see what it would do to dragon hide.
The barrier goes up, and soon the creature crashes against it, snarling - until it starts to back off, six eyes squinting hard from the glow.
Hiccup glances back that way and motions Toothless closer with a hand signal, swinging into the saddle and tugging at Keith to slide on behind him.] Toothless is faster, we can be gone down the tunnel before it has a chance to hear which way we went. Can Red keep up?
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The barrier goes up, and soon the creature crashes against it, snarling - until it starts to back off, six eyes squinting hard from the glow.
Hiccup glances back that way and motions Toothless closer with a hand signal, swinging into the saddle and tugging at Keith to slide on behind him.] Toothless is faster, we can be gone down the tunnel before it has a chance to hear which way we went. Can Red keep up?