(Sorry I've been slow! D8)
"They are real, they're just not in this world, you know how it works." Helena replied, regarding Joe as it it were the most obvious thing in the world, before the question regarding hydras seemed to spur her into action, and she reached round in her book of papers.
She renched it open and set it on a page, a detailed sketch of a reptile, a creature dripping with slime and weeds, dark eyes and sharp fangs on three wedge heads.
"Swamp hydras. They've been breeding in huge numbers in thw Maudlin Marshes and started attacking travellers so....I've had to try and do something about it. They're a lot more agressive now though. They used to be quite cautious....but now they'll attack..on sight. It was a close one quite a few times. That's why I really need help with these things. Xander can only help me so much and..."
She trailed off for a moment, glancing back over her shoulder, as if keeping check. What stood behind her was nothing but a featureless wall of the room, but she seemed to be checking in great detail as if there was far more to keep an eye on.
"So, should I make some copies of the field guide? That should fill you all in on what you missed."