It's well traveled, it would seem he's been here a while, and you notice that there are some defenses that be could deploy if needed, but in a fashion to prevent incursions rather than anything he's trying to lead you into. The entrance to the cave has a line of something white across it.

Disturbing it as little as possible, Mark will take a closer look at the white substance.

Investigation (with mod): 17  

Looks like little crystals. Salt?

Blue will try to peer within the cave, and listen to see if there‘ a any noises coming from it.

Perception: 2

Mark hangs back some and quietly says to the group "I think he's harmless, just a bit insane.  I'm assuming he's been alone on this island for a while.  As far as I can tell, the area is safe, and he has a salt line across the entrance...nothing that should harm any of us."

He'll take a breath hoping he's right, and then step into the cave.  Once inside, he'll look around.

Perception: 18  

Ember steps gingerly in behind Mark (Goliath) and takes in the interior of the cave. "So how long have you been here exactly, Mr. Mark?"

Perception 20 

Talon will follow the group, but will wait outside. Something about being underground gives him pause, almost as much as the thought of suffering more of the old man's ravings. 

He'll make sure he can recognise the cave or the area from above and do a little more scouting for water. Perception d20: 16

Blue and Ember's eyes have trouble adjusting to the dim interior.

Guy looks around. "I'll keep watch out here."

Mark sees a series of defensive chokepoints leading back, but as you follow the old fellow, nothing goes off or triggers, and it eventually opens up into a rather homey little space, with assorted scavenged furniture and belongings strewn about. There are some planter boxes made out of scavenged crates and barrels that look to be some sort of mushroom garden, and nearby is a what looks to be a small pantry carved into the rock, there is a hanging leg of dried meat and some other boxes and barrels of what look to be foodstuffs.

A small trickle of water makes its way down one wall, pooling in a basin before running along the floor and out a hole in the wall. There are wooden planks placed over the stream to allow it to be crossed dryly, that passage leading back to a separate chamber.

"How long has he been here, didn't you say you was just here this morning? Unless you were here yesterday, and fell asleep and forgot getting here.

Talon, on watch above,  circles the forest, noting the rising elevation as you move inland from where the party disappeared into the cave. You're able to make out a stream that heads in that general direction, but you lose track of it until you loop out near the ocean, where you notice a disruption of the sand, where it's been washed out in a bit of a delta. Rather than a stream or river that you'd expect, the water gurgles forth from the rocks, spilling out and washing the area clear of sand.

"I believe she was speaking to you, though it is possible we arrived last night.  All I know is the sun was blinding when I awoke.  Didn't you say your son was here as well?"

Noticing the water, Mark licks his dry, parched lips, the heat and exertion of the day catching up to him again.  Motioning, he addresses the loon again.  "Mind if we have a drink while we talk?  The sun, sand, and time have done a number on us - not to mention the fighting."

Big'Un is not saying anything. He is content to let the two Marks talk.

"Oh, I don't remember. It's been years at least."

"He's resting, he might join us later."

"Ooo, I want to see that trick!" He dips a shell of water and hands it to Mark, watching expectantly for the goliath to drink while speaking.

Mark graciously accepts the shell and takes a sip, relishing the fresh water.  He takes another sip, and then passes the shell to Big'Un.

"So....Mark....what can you tell us about this island?"

Blue will take the shell as well, and listen to what Mark v2 has to say.

Other Mark is a bit disappointed that you don't do a ventriloquism act, but happily refills the shell until everyone has drank their fill.

"What can I tell you about the island... Hmm... well if you run into Bob, don't listen to him, he's not real. The sand seems comfy, but don't camp on it unless you want biters. Save food when you can, cause then you'll have it later when you don't have food. You already know not to drink the ocean..."

Blue frowns.

"Biters?  What are those?"

"Little bugs that live in the sand. Not bad eating, if you get enough of them, but that's hard to do without bait, and well... No one likes being the bait."

Talon would check the water more closely (colour, taste) to see if it was drinkable. If yes, was there any good camping spot nearby, a defensible position?

Investigation d20: 9

Survival d20: 9

Son (?) awakens slowly from the voices in the adjoining chamber. He lays quietly under the blanket listening while he checks the state of his injuries.

Recognize the voices, except for father's: 17

As the talking stops and the sound of drinking begins he realizes how incredibly parched he is. He carefully sits up and rises unsteadily to his feet, keeping his red scaled hand on the wall for support as he shuffles towards the sounds of voices and water.

Stepping into the chamber he looks at people assembled on the far side of the stream. He spots his father (?) and rasps,

"Father...? I need a drink-"

He moves carefully forward and sinks to his knees at the water to scoop it with his hands to his mouth before looking up and trying to figure out if he should know his father's friends.

Hard to keep track of your parent's friends: 18

Talon's first taste is a bit brackish, and there's an odd aftertaste he can't quite pin down. Up closer to the rocks, it's not as salty, but the odd, somewhat unpleasant taste is still there.

"Ah, my boy! I found some folks that might be friends of yours? They arrived just this morning too. How are you feeling, do you need to go potty? You remember how I showed you?", he asks, pointing to a gap in the boards spanning the stream where it plunges back into the rock and continues it's way to the ocean...

 The rest of you see a rather beat up and bandaged looking red, scaled reptilian fellow, currently wearing more bandages than clothes.

For his part, the red scaled fellow can't remember anything before waking in pain, and only snippets of the old man who called you 'son' bringing you here and tending your wounds since then.

None of these people look or sound familiar.

He looks from his father to the people, not recognizing them, he says,

"I don't...maybe I know them? Where did they came from? Who are they?"

Then back to his father, shuddering at the memory of that lesson,

"I'm feeling much better, thank you. I don't need to...use the potty again."