Derek feels bad about handcuffing Isaac to the bars. Isaac has proven how much he’s grown, how great his control is, and Derek feels like he’s punishing Isaac by locking him up again.
As soon as Derek is watching Peter rise from his grave, he knows he should have followed his gut and let Isaac run loose.
Stiles and Scott arrive soon after Derek’s taken. Boyd is still unconscious, Erica is almost awake, and Isaac is fighting against the cuffs, rumbling deep in his chest. Scott warns Stiles not to approach anyone but Isaac – which makes no sense to Stiles considering Isaac sounds absolutely murderous – as Scott goes to the other two Betas.
There’s at least six feet between them when Stiles speaks up.
“Um. So! I see you’ve had a shitty night, too.”
Isaac’s yellow eyes flicker to Stiles’s face then away. “Lydia took Derek. Let me out so I can find him.”
Stiles’s mouth hangs open for a moment. He swallows against the lump in his throat. “Can you repeat that? But try to make sense this time because I swear you said-”
“Lydia came here, poisoned Derek, and dragged him away.” Isaac growls. “Open these cuffs so I can help Derek.”
It still doesn’t make much sense, which is what Stiles wants to say, until Isaac uses his wolfy-psychic-powers.
“I’m not going to hurt your girlfriend, Stiles. She seemed like she was under a spell.” His gaze meets Stiles’s, and he gives Stiles a reassuring smile despite the situation. “Do you trust me?”
A few weeks ago the answer would have been a resounding no, but after all the bullshit Matt has put them through, Stiles needs a few more friends on his side. “Yeah.”
Isaac nods once and breaks the handcuff off when Stiles reaches for it. “Thanks.” Isaac grins, patting Stiles’s shoulder. “Now – let’s go save Sourwolf.”