I don't remember which fic I found that from but I love the quote. 

HEADCANNON & LORE TIME: With watcher masks, if a listener/watcher wants to find information they use the masks to get it. The masks basically hold data for the group they represent.
So when Martyn tried to look into Grian's mask, he only saw what he saw because that was going to be Grian's mission. Find and recruit after he was done learning ;)

TW: Unconsciousness, magic burns, scars, mention of funerals, and skulk possession.

The small hermit fell from the sky and into the waiting arms of his admin.
It was over, they had won. The hermits looked at each other in question.

What had happened to Grian as they were rescuing him?

Martyn winced as he stood up. Burns from Grian's magic littered his skin. He was offered a healing potion by Joe (who had made his way over after Naya blasted Grian from the sky) but refused. Healing potions don't work for watcher magic. Listeners would keep scars from watchers and vice versa. Grian would get a couple more as well. The listener walked over to Xisuma and peered down at Grian.
The avian looked so small and delicate... but Martyn wouldn't be fooled. He reached down and ripped that damned mask off. He felt the watchers suffocating powers radiate from it and the world swayed.

Mayrtn opened his eyes. Hermitcraft was gone and he was drifting in the void. A figure huddled into themselves near him but he couldn't move. It was pointless.
He staggered back, dropping the mask. 'What on earth? There was nothing of value...?' The grassy and familiar ground of Hermitcraft stared up at him. Naya looked at him, confused as did some of the hermits.

"Martyn, you good mate?" Xisuma asked. How would Martyn respond to that? 'Oh I was just transported into the void and saw some random person there, I can't remember who and my burns really hurt,'
"I'm okay." It was curt but the listener had more things to worry about.

He took another look at the watcher before him. 'What have they done to you?' Watchers were cruel, power-hungry creatures and would do anything to convince people to join them.

'I'm sorry'
Two powerful words. They mean very different things at funerals but Frog was choosing to ignore that. They couldn't fight anymore with the skulk that invaded their mind and watched helplessly as their body went on autopilot. It felt so wrong not being in control.

...Is that how the skulk felt? Wanting control of something or someone that it normally would have control of?

Frog felt a sense of morbid connection with it. All the skulk wanted was a home to belong to. They would posses living beings with the hopes to achieve control and when they got it, they were just following orders. They were messengers.

And if they were messengers, who was the higher power?