On an optical level, perhaps it helps BB cut his losses to some extent, since his crew still got kinda humiliated by Garp and then also Koby himself who proved to have great potential. That after also allowing Law to bolt, and iirc there's no confirmation he did get steal poneglyph copies. I could see why Blackbeard would be furious. That said, in a hindsight, global-disaster level of anger might be too far-fetched. But, maybe something else happened off-screen? :maybe He does possess the power to destroy the world via a fruit capable of causing massive earthquakes even at the hands of a dying old dude, whose prime version Blackbeard is bound to surpass(if he hasn't already), that and how it suggested the Lulusia incident may not be related makes me think there's at least a tiny possibility could be a promo for something even scarier. But I understand that until outright stated if at all, It's just hopium sponsorrd by my VS infected mind.