It was, at least, a very good milkshake?

Nina blinked and then, perhaps more incredulously than she... no, she meant it, she did, blurted, "You want to talk????????????"

About something serious? About something that she'd taken to stalking through Insomnia's public libraries to see if she couldn't figure it out on her own, in a backwards and sideways manner because she'd figured he wouldn't want to talk about it?