Leth relays this to the group.
"Here's my thoughts." He says, to whoever is listening. "I'm assuming the message in Thieve's Cant was left as a guide, to point us down the correct pathway to the 'happy hideout', whatever that may be. I could be very wrong in that assumption - it may mean nothing to us at all - but that's the assumption I'm making for now. If that's the case, then "trust in wormfellow" would mean that we should take whichever tunnel is indicated by wormfellow, whatever that is. The question remains, then, who - or what - is wormfellow? And how would it indicate to us which way we should take?" At this point, Leth is more thinking out loud than anything else. "Was one of these tunnels eaten out of the earth by a large worm? Is there a worm around here that frequents one of these tunnels? Is there a sign of a worm hidden somewhere in this chamber that could give us a hint? Or, like the worm, should we dig deeper into the ground, and rappel down to the second bridge in the pit?"
He thinks for a moment.
"Or, maybe I'm overthinking this entirely too much, and the message is nothing more than graffiti." He finishes with a shrug.
Rolls
Insight - (1d20+2)
(17) + 2 = 19