[Mikumo hums slightly, as if she sees his point on the communication but would prefer to find a safer way.] It's a means to set up exchanging information in person, if nothing else. I'm used to using a closed network, so something I know is being monitored just rubs me the wrong way, I suppose.

[There's an almost detached manner to that, like she's making an observation about her own behaviour that she only just noticed herself.]