"You think I haven't tried? You think I don't ask questions? He shuts me down as soon as I do, which is why I'm trying to wear him down." Stiles asked him personal questions but small ones that wouldn't make Derek instantly clam up. Derek was stubborn and so was Stiles, it was probably the only reason why their friendship had even gotten started. "So clearly, you aren't getting the whole picture. And I have the right to be pissed at him when he hides important shit like almost dying." Freezing Derek out wasn't mature but it got results and he didn't doubt that Derek would apologize to him soon enough. He just had to keep at it because he knew it frustrated Derek even more than when he thought Stiles was talking too much. Weird but true.
"Anything you can. Not helpful but pretty much any information would be useful since we don't know much about them outside of them being violent killers. You can start though with weaknesses, if you can pick up on that. Things like if they get along or if they're fighting, stuff like that." It might be something they could exploit if it was going on. "Or plans they have for us so we're better prepared."