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watch the situation between the girl and the guy.wait for an awkward situation and go and casually open.
throw him off guard with a new threat (you) to his potential girl.
This is stupid advice.
First off OP, don't come from a frame of mind of "trying to seduce the girl" come from the friendly and cool vibe, then fun-loving dude that's just talking to everyone, and engage both of them.
However, you gotta come from a higher reality than the one they're having, your frame has to be stronger than their, so that they get absorbed into it. However, that's the thing, don't "worm" yourself into the interaction like some value-taking leech. Come from a value-giving frame of mind, and just have fun.
Last bit, don't expect to succeed, because it's possible you won't. Let go of the ego of wanting to be a mPUA, and just have fun, simple as that.
If you get blown out, then it's they're loss, you're just having fun and sharing it with other people.
Also, girls come to bars and clubs to have fun mainly, if she's "talking" to some dude in the middle of the venue (eg, not isolated), chances are she's not hooked yet, so DO that, by providing FUN.
However, the fun has to come from within, don't be the clown and try to impress her. Self-amuse, and spread that.