Oh. It was this kind of mad.
There was no helping Geary now. His mind was gone, replaced by that shimmery green thing. "It is always possesion. We never get to talk with someone conventionally insane" Despite the situation Heian giggled, the joke was good.
Geary noticed them, ready to green them too. At least Elrodan was safe for now, they could focus on the fight.
-Sorry, there's no more space in my head. One voice is enough
Heian slowly walked down the hill, without pulling the sword yet. Why waste a fine suprise effect for no reason?
-What even is this green thing?
-You will soon learn, willingly or not. Oh you will learn, you will learn...

It looked like negotiations were over. Geary charged, with a knife in... one of his hands. It dissapeared from the sight beneath one of przedramiona. Heian prepared his sword, not changing his own speed. Geary still could think, apparently, because seeing the length of Heian's blade he changed the tactics. He raised his right hand, without a knife in it, and launched several small, green bolts in a quick succesion. Whatever those were, touching them wouldn't be optimal.
Heian raised a light wall in front of him. He managed to block them all, but they left a couple small holes in the wall. Geary somehow managed to corrode a literal light. The fight had to end as quickly as possible, if they had more of those rocks back inside those tunnels, things could escalate in a lightspeed.

The wall moved forward, to slam Geary. Those holes made it rather useless at blocking, it could as well help in other way. Geary rolled to the side and shot another salvo of green energy. This one was not as accurate, making small bolts spread in a fan of sorts. Which only made it more annoying to dodge.
Heian decided not to bother and simply got down behind a nearby log. It twitched when one of bolts hit it and started to dissolve into green goo. He got up and rushed forward, with Geary ready to launch more green projectiles.

Sparky was furious at Elrodan, how dare he just sleep when his help may be needed! With the crackling doing nothing, the little fire mote instead sat on the end of Elrodan's nose, the burn gentle enough to not really do any damage but still enough to cause the fairy to react. Elrodan swung up an arm, to swat at the end of his nose, a slight green glow in his hand for healing as if by some uncalled for sense. This swiping action was easily dodged by the little flame but less so for Elrodan who ended up slapping himself and throwing his body off balance from where it was lying, to roll onto the floor.

Meanwhile Geary smiled as Heian hid behind the log, as the foe sprang back up and charged in, his smile widened as the collection of goo grew ready to be struck in at close range. At close range, it would be an easy hit, and putting a bit more into the power, it would do more than just sting a little, well only for a very brief moment before death. The hands moved back a little, ready for the big push forward and end Heian mere feet away. The push of the hands forward was never given a chance to happen, as a second wall of light erupted besides him and pushed into him hard and sent him sprawling to the ground, the amassed energy in the goo falling to the ground in a puddle just to the side of where his head fell.

If Heian cared to look, he would see the small fairy flying towards them, his eyes glowing and one hand extended before him that had been summoning and controlling the light wall.

Heian was already somewhere else, without his bright red coat people seemed to miss him somehow, like the coat was the only part they noticed.

He got up a couple meters away just to see a light wall blocking Geary. Did Elrodan wake up? Yes, he was zooming to the log he hid behind earlier. Seriously, was that red stigma covering half of his face so hard to notice?

When Geary got up, Heian was already close enough to knock him on the ground again. That was the plan at least, because his chin didn't move at all, like if Heian punched a statue. The statue would feel it more than Geary did.

-Drop the fight, there is nothing you can do - his eyes starting to shimmer green and Heian had to back out before him. The wave of green almost hit him if not the light wall that flied in front of Heian.

While behind the melting wall, Heian finished loading a crossbow, that he soon used, shooting all three bolts at Geary. This finally showed some effect, his head went backwards and he lost the balance.

While still lying, Heian's sword pierced his neck, pouring a green fluid that probably couldn't be called "blood" anymore.

-That was tougher than I expected - he sighed - thanks for that wall, I owe you one. Now let's grab that stone and delete that mineshaft from existence

He detached his protesis and separated the hand from the rest, just in case the stone could somehow infect circuitry. He carefully caught the stone and went to the mine. After throwing it in, still not attaching the arm back, approached Desjani.

-You got any explosives?

-Yes, but what for? And why you two left us alone?

-Deleting the mine. Those stones you were mining are too dangerous, as Geary's example showed. We couldn't help him
-But what will happen to us?
-You will get back to where you began. I'm sure there are other mines around hier, maybe even less deadly than this hole

Some time later Elrodan led Heian to the woman the whole thing started from. After ensuring her miners are safe, the headed to Pale City.