[To take the journal, he'd need to let go of the spear or let go of the shoulder. He opts to let go of the shoulder, but shoves Derek, perhaps a little roughly, and takes the journal as the guy is no doubt tripping up a little. As he does this-]

I have no reason to trust they are not my enemies. I, after all, have a great many. And make no mistake, at this moment, you are my prisoner.

[But he will glance at this guide. It's long. It's not that he can't and doesn't read, it's that he doesn't want to in front of a prisoner]