"'Lo, Di," said James, almost smiling at the sight of her - a rare enough occurrence, these days. He was well aware that Diana had quite probably saved his life in giving him a place to stay - he had, at first, been in no condition to fend for himself - and as far as he was concerned, he owed her. Among other things, this was a chance to begin repaying her, and seeing her happier was a relief - at least someone might get out of this in one piece.
"I haven't seen him, but he could be inside already; I haven't been here long." He paused then, considering what was both a complicated question and a slightly dangerous one. Of course, they meant to discuss sedition, and the Muggle world was the safest place to do it, but he preferred to leave most of that for when they were inside. Inside you could watch the people watching you, and there was a finite space you needed to check for charms and magical devices. Outside there were people - and things - everywhere. "He's ... an odd bloke, I suppose. Not like his brother, really, except ... well, you'll see that part when you meet him. A bit on the rough side, if you don't know him, but his pub was safe. When he wanted it to be safe. And he's dangerous. Bloody dangerous, I'd say."
At that James did smile, if grimly: when it came to specific instances, he might object to some of Aberforth's methods, but on general principle he thought dangerous was exactly what they needed. Given a wand and half a chance, he intended to be as dangerous as he could himself. He slung an arm around Diana's shoulders in a comradely fashion, both as a sincere gesture of affection and a clear sign that she was with him rather than following him - just in case, in these suspicious days.
"Let's go in and see if we can find him. Enough waiting about, yeah?"
And since Diana had only been here a minute, it was clear that he meant more than simply 'waiting outside the pub'.