[That stare continues unblinking even at Light's sneeze.]

So you have deduced that Watari is bringing a secret cold remedy.

[A few more seconds of observation pass, observation that might have made a lesser man uncomfortable. By now however Light was probably as used to being observed by those panda-like eyes as he was to those gestures.]

Light-kun's powers of deduction are dangerous indeed... Maybe it's to be expected when sick, going into a conservative state of mind, that is.