[This is starting to be rather uncanny, all the things she's done that he's somehow identifying with... He just can't be cute about it, huh? Then again neither of them are any cuteness expert, gonna need to call someone else in to judge that aspect, hm.]

You could think of it as concern, yes: you'll worry and compromise your companions if you don't take care of yourself better. You could think of it as a complaint, too: if you're going to get yourself killed, at least make it at the hands of an actual killer. You could think of it as a warning, also: if a high school teen with no magical experience and limited combat training could do that to you, then how vulnerable does that leave you against someone more skilled and calculating? You could think of it as a reminder: of your weakness and what you need to improve upon, if you truly believe in your cause and are committed to it with everything you have. And last but not least, you could think of it as a threat: if I end up capturing you, I'll make sure you don't die, and we can take our time going through all the other things that are much worse than death.

[Yet there's nothing like anything she's just described from her emotional feed on the other end: no like concern, hostility, or everything in between. He may feel like he just got lectured, if anything.]

Does that clarify better?