Erek goes to work on those restraints. Starting with Jarvis's internal functions, freeing him up so he can examine the surrounding system more clearly. The way he sees it, if Jarvis can monitor what's happening he's more likely to remain calm. And more likely to trust Erek, which will be essential.

They were very alarmed. They don't understand what you are.

He really has done this before: he's quick to recognise previously-identified weak spots and hit them, triggering the binding tentacles to shut off and recoil. As soon as he can he'll show Jarvis how to handle them. They've worked hard to secure the human AI - Yeerk paranoia obviously won out over arrogance in this case.