[The gesture L makes with his hair doesn't escape Mello's notice — how could it? — but they've both picked up habits from L, haven't they? Thing is, in order to pick up that particular habit, one would've had to have witnessed it. In person. Which means — ]

[No. He's just distracting himself from the problem at hand.]

You. [Cynicism, be they name.] Tossed the key to your place.

[Who the fuck does that? Especially when your partner just up and disappeared; when you've no place else to — ]

[Nevermind. It doesn't matter. All it does is prove that L's in a fragile state, which Mello would prefer to pull him out of, as soon as possible. But L is manipulative, and L is a liar, and Mello — ]

You know I'm keen on my studies, yea. [Yeah.] Did you come here because you knew I'd insist you come stay with me?

[It's totally within an acceptable realm of paranoia.]