Monty, Billy, Lily and Nugget sat by the Nugget cave and spoke quietly to one another, about what to do and how to get evidence as Monty did chime in that he couldn't do much thanks to The Old Janitor.
"Ahm."
They all turned instinctively.
"Felix?"
Felix, Theodore and Penny.
"We, overheard you guys from the stairs; Principal took Kid?"
They nod, Felix nods,"We want in to help.", they were surprised, glancing at one another but at Penny especially since she was the daughter of The Principal.
Penny lowered her head,"I know you don't trust me, but Kid helped me and I want to return the favour.", Theodore nods, approaching them,"Yeah, he helped me too!", Nugget ate a Nugget,"Nugget believes they'll be useful to find Nugget's Friend!", Nugget stood up, handing them each a Nugget and they all were confused.
"Nugget wants you to have a Nugget of Friendship; A Sign of trust in this case."
Felix frowned,"Riiight. Anyway; What's our first step.", Monty nods,"We need evidence, once we confirm if Kid was taken we can come up with a plan.", now that was problem Number 1; Getting the evidence, cause last thing they want is to jump to conclusions and find out it was a misunderstanding.
"That can be arranged."
Penny smiled,"As The Principal's Daughter, I have access to the school CCTV; Perhaps we should check that.", Billy nods, the bell ringing as he did,"That's a good start.", "Children! Time for class!", looks like their teacher Miss Applegate still looked like a wreck.

=

The Headmistress carried the boy into her lab, he was fast asleep still and she didn't worry too much about waking him.
But unlike the others, she wasn't gonna turn this one into a monster; No, no.
Once getting her hands on the children's files, she found some interesting and intriguing things about the boy.

His mother.

Frisk Dreemurr.
Once a child that went missing up the mountain, came back after freeing monsters that they claimed to be their family.
The Principal had heard and all things about Soul Magic from both monsters and humans so she suspected Kid has something to hide.
Kid was always alert, seemed to always be calculating and not to mention he's always doing things for his classmates for items or somehow has stuff he shouldn't.

She laid the kid down, putting a mask over his mouth and nose, closing him in a glass case to be observed and then experimented on once she found out what he was hiding.

=

Penny downloaded the necessary footage she needed, once unplugging herself and taking the USB out, she walked back out of the room and to the Computer Lab were they were waiting.
As she walked down the hall, she felt other students tense and scurry away.
'She's a radar in a dress'
'Better avoid her if you want to keep your stuff'
'Principal's Pet'
It hurt, she was just doing what her mother told her and, now she knew it was wrong and she was going to help Kid.

~

"Here."
Felix took the USB from her, plugged it into the laptop he owned as Monty said it was probably best not to plug it into the school computer or The Principal could catch on somehow.
Lily, Billy, Theodore, Nugget, Monty and Penny sat around Felix, which he was very uncomfortable about and certainly not use to, and they went through the footage.

They see Kid leaving the bathroom, they caught a glimpse of Stevie and guessed Kid gave him a packet of cigarettes.
Then the Principal approach him, they talk for a second before she walks down the hall, Kid looked nervous and almost sick, but he then began to walk to the office.
Switching the footage, the Principal and Kid were sitting at a table with drinks and cookies, so Kid drank and ate while she was talking.
Felix, glancing at the clock and began to speed it up to hurry up and get the answers.
Then he slowed it down,"Wait. . ."
The footage showed Kid, looking tired and seemingly fighting to stay awake as the Principal just stared and smiled at him, he then went limb and she picked him up and carried him to her desk.
Then he left him on the chair, opening the door and they saw Lily.
"This was when I asked her. . ."
So Felix sped it up again, stopping once The Principal picked up Kid again.
And to their horror, she lifted the carpet and, low and behold; A Trap Door.
And she carried Kid down, and when she came back up she didn't have him.

Felix immediately saved the footage, backing it up to different files,"What are you-?", "We need to have backups; This is evidence, Lily was right!", Lily was close to tears, Billy holding her close to comfort her,"What do we do now?", then they heard footsteps, they held their breaths and Felix closed the laptop.
. . .
"Kids?"
Bob, The Nice Janitor, entered the room and that, they just all let out a sigh of relief.
"Sorry if I scared you kids, but Mrs Applegate is looking for you, as well as Felix, Theodore and Penny's Teacher.", so, Monty whispered they'd meet as soon as school ended.

=

The Principal first did a scan of Kid, see the surface before anything.
The computer picked up scars, bruises and cuts that wouldn't have been seen unless in a certain lightning possibly.
Some scars on his face, a scar wrapping around the neck and a bunch around his arm, legs under his shirt; How did this boy get this scars, scratches or bruises?
Though, she did note some the scaring around his eyes looked like he was hit repeatedly with something.
Like. . . The end of something? Broom, mop??

=

The bell rang; Kindergarten was over!

While kids got on the bus, Lily and Billy were handing their address to Penny, Monty, Felix and Theodore.
"Let's meet at our house, we can talk there as Nugget is coming home with us."