Yes, it was the beginning of a beautiful - something, but it relieved Batman of some of the tension he'd been carrying since Ra's return to Gotham, knowing Dinah had someone close by to do what he could not. Dinah was a capable woman, but Ra's was an insidiously intelligent man, confoundingly brilliant, and if behaving like a chauvinist, if that's how she wanted to interpret it, kept her alive, then it was worth the effort.
Batman's suspicions were confirmed, and he smirked, grimly. Dinah had given no details as to the depths of the danger she was in. "Talia al Ghul, daughter of Ra's al Ghul. I don't know how much you know of him - he's over six, maybe seven hundred years old, and started the organization the Demon by the time Columbus discovered America. It's since spread to incorporate multiple eco-terrorist organizations around the world, including the Demon's Hand, and most infamously, The League of Assassins - the Demon's Fang. His daughter is, in her own way, nearly as deadly as he is, thought not as clever."
Explaining why she was more particularly a threat to Dinah was an uncomfortable task, for two reasons: he wasn't certain how much Hal knew about Dinah and Ra's relationship, and it involved opening up a part of his own personal life for Hal to inspect. "Dinah has a personal connection to Ra's which he has reason to resent. He takes that personally, and Talia is never far behind when it comes to family honor. Additionally-"
Batman tried not to look away, and just failed. He forced his eyes back. "Ra's considers me his ideal heir. He's been trying since we met to... arrange a marriage between myself and Talia. I've refused, but he's rather insistant, as is she. "It would have been difficult to resist her if she hadn't been a dangerous psychopath who followed her father's every order. "They feel we've slighted them. Honor is everything.
"As for how many," Batman couldn't begin to calculate, and he had actually tried to accurately survey the extent of Ra's empire. "There's no way of knowing. I trained with the League of Assassins as a young man, and there were hundreds. There are likewise hundreds in the other branches I've encountered, but I've been unable to determine how far the Demon has spread throughout the centuries. I doubt he's sent his full force against us, or that he will. So far, it appears to be a personal vendetta, waged by himself, and possibly Talia, and Ubu." Ubu. Batman tightened, and shifted to contain the ripple of anger. "Ubu is a very large man of Arabic descent; usually over six feet, 350 lbs., all muscle, barrel-chested. Ubu is not always the same man, but assumes the same name and position as the last. If you see him, getting Dinah away is your first priority." She could handle him. He wanted to be certain. He also didn't want to take any chances.
He was telling him a lot. More than he'd probably ever said to Hal Jordan, but it was important that he knew exactly what he was up against. Which is why he explained the one thing only a handful of people knew. "One last thing. Talia is very beautiful. Never forget who or what she is." This time he did not look back when his eyes moved away. "My youngest son is hers. I didn't have a say in the matter."