[Initially, he'd been psyching himself up t8o tell Grell the bad news, to elaborate on some of the things he'd heard lately...but when he finds her in the midst of her work he can't help but return the grin and completely push all of those thoughts from his head. He recognizes this look, recognizes it from his friends and from himself and he knows better than to pop her bubble. So instead, he setting out a couple of sheets of paper and a jar of what looks like wax.]

It's your project, Grell. I'm not interrupting it with my ideas until we see how effective yours are. [That is to say, he trusts her to actually make progress with this.] Got the ash? I can start mixing paint while you're finalizing the test notes so we can get started.