She follows along well enough, and eventually says "okay, stop now."

"Derek, what's the plan here? Is it just going to stay with you?"

"She is staying here until he decides otherwise; I'm not kicking them out."

"What if someone sees them?" 

"The kobold has magic. I'm not too worried."

"Right. Anything you need from me?" 

"We're okay. Go home." 

"Goodbye kobold."

"Goodbye."

"Kobold understand try?" 

Headshake.

"If difficult to eat and I try eat, I maybe eat. Maybe yes, maybe no."

Nod. "I understand."

"Kobold want to try look murderer? We go outside, we look."

She looks somewhat confused, but: "okay."

"Derek want see murderer and capture. No more killing."

He leads her outside.

She follows, looking around curiously at everything.

There is plenty to look at.

The parking lot, trees in the distance, the sun... 

He seems to be walking her to his car. 

Yeah, that's not as surprising as it could be.

When they get there, she pauses for a moment and then teleports into the backseat.

Sure. Derek drives them from his apartment throughout town, with the window open. 

He stops occasionally when he smells something suspicious, getting out to examine the area. 

Like outside the school. 

She doesn't get out of the car; that wouldn't be useful anyway, she can use her mage-sense to check things out just fine from there - she's mostly checking for people with obvious weapons or minds similar to the killer's.

There is in fact someone who resembles the killer outside the school, barely ten feet away from them.

Derek steps outside, oblivious.

...well, fuck.

She sets up a teleport trap between them and her tribemate and scrambles into the front seat where there's better cover.

"Ms. Blake, what are you doing here? Shouldn't you be in class?" 

"Oh! Hi, I was just, I mean, how are you?" 

She approaches.