[no, he has no idea what Kaiba's day has been like, so he appreciates him not snapping at him. he does, however, make a face, though his sourness isn't directed at Kaiba. it's more:]

So am I. [he fishes his phone of his pocket and waves at Seto] I'd thought for a minute ... [he'd hoped, but no. he blows out a breath, frustrated, and puts his phone back in his pocket] It's irritating.

[a beat]

It also makes me wonder if it's actually putting out power. [is this true electrical power as they understand it, or is this just an extension of light, which this place seems to keep getting wrong? he's inclined towards the latter, but] ... what I wouldn't give for a multimeter.