It's only because of that singleminded focus that it takes Ginko as long as it does to realize Joker is there. He's pausing in his work, leaning on his pitchfork while he catches his breath, when he finally catches sight of the - in retrospect rather obvious - stage manager.

Should he say something? Almost immediately, he remembers what Psi had told him just the other day. Of course, he knows that it's not like he's going to end up yelling at Joker, but that's not to say he won't find some other way to screw up.

So instead he just stands there like a deer (ha) in headlights, ears drooping.