Of course there is a door for him to get out by when he wakes.

He'll come up here.

I know he will.' Dicky said, and his voice was not at all firm (I noticed that at the time), 'It doesn't matter, if he's ALIVE.' 'Unless he's come to life a raving lunatic,' Noel said, and we all stood with our eyes on the doorway of the turret--and held our breath to hear.
But there was no more noise.
Then Oswald said--and nobody ever put it in the Golden Deed book, though they own that it was brave and noble of him--he said-- 'Perhaps it was only the wind blowing one of the doors to.

I'll go down and see, if you will, Dick.' Dicky only said-- 'The wind doesn't shoot bolts.' 'A bolt from the blue,' said Denny to himself, looking up at the sky.
His father is a sub-editor.

He had gone very red, and he was holding on to Alice's hand.