Hammerspace dragons are a fascinating species - able to easily fit nearly anything past their jaws, they frequently dine on inexperienced adventurers who see nothing more than a tiny dragon (and inexperienced hammerspace dragons frequently die to adventurers, due to their small size and lack of defenses).



Vincent here is much larger than most hammerspace dragons - whereas he's about as long as a human is tall, the overwhelming majority would fit in someone's outstretched hands (although they prefer fitting AROUND those hands... and the hands' owner). An interesting side effect of their ability to ingest any size of prey is stunning control over their internal, space-warping insides; Alice and the metal cable went into separate places, and neither Alice, nor Garland, nor the cable were ever near his hoard.



As for the disparity between Alice's measurements and Jessica's fate, think of it like quantum genitals - until observed, only the dragon knows what's there. It's not uncommon for a female of the species to occasionally claim prey through a lower entrance and enjoy their attempts to climb free for as long as they can stand it.



When a hammerspace dragon is killed, its corpse appears to be that of a very small, but otherwise normal, dragon, with an empty stomach; attempts to recover items eaten by a deceased hammerspace dragon have all been unsuccessful, although there is unsubstantiated rumor that others of the species can do so.