[A flinty edge appears in Light's eyes at the blatant hint, initially taking it at face value to be a threat. Following their last encounter where Mello had offered to help him disappear in the name of putting him out of contact with L, Light had been on his guard. It made sense, after all, that if Light could not be extracted alive from the equation, that Mello, Near, and whoever else might not see it out of line to kill him.

He had assumed, to this point, that they had not already done so because his partner had been keeping them at bay. Though, with the newest revelation of having not spoken to them in a long while...]

I guess that would depend. [he ventures at last, pocketing the mirror]

Namely, on how dedicated people might be to discouraging others from looking for the someone in question.