Something isn't Right!
Through the whole day, Arthur just stayed inside his hut and never left. He had to plan what to do, and what benefit he should stop at.
'Should I try and kill the whole camp?' he thought to himself, but he rapidly dropped this idea, 'I don't have enough time in my transformation.'
He was planning to use his dragonair form, attack the camp from above, destroying everything they had built for defending this place. There were many drawbacks to this, first of all the short duration he had in this form. He only had half an hour, a couple of minutes more or less.
The second problem was the extreme weakness state after the transformation ended. Though he could regain part of his strength in ten minutes, he wouldn't be able to do a thing if someone, like Aron the leader of this army, found him.