Following a pretentious attempt at a Badass Boast from Miles about how everyone present is a "disruptor" (as in an innovator, someone pioneering the future), Helen (impersonating Andi) clearly and precisely delivers a "The Reason You Suck" Speech to him and everyone else present, noting that, despite setting themselves up as brilliant and powerful people, each of them would have floundered and lost everything if Miles hadn't stepped in to rescue their careers. Even though they (and the audience) don't know at first that this is Helen impersonating Andi, it still makes for a powerful statement, given that she believes someone present killed her sister to protect Miles. Even more painful, the friend she mentions is Andi herself, when it's revealed they lied under oath about who created Alpha, and later almost continue to lie about Helen, valuing their careers over the one sensible person in the entire room.
Helen:That is the common thread here. Every single one of you is holding on for dear life to Miles Bron's golden titties. And each of you, you'll stab a friend in the back to hold on. That is what I believe.
Blanc effortlessly reminds everyone why he earned his reputation as a master detective by solving Miles' planned murder mystery, which was meant to last for an entire weekend, in a matter of seconds. Before the murder actually happens, for that matter.
He does this all while busy helping Helen solve her sister's murder.
Though his attempting to blackmail Miles with the information significantly dampens it, Duke manages to deduce that Miles killed Andi within moments of learning about her death. For comparison, Blanc has known about Andi's death for a week. All Duke had was being almost run over by Miles, on his way to visit Andi the day of her death. Regardless of his foolhardy blackmailing effort afterwards, the actual guesswork itself, especially from somebody as ostensibly dumb as Duke, is still pretty impressive.
Near the end of the film, Blanc realizes Miles is a total moron, and ingeniously points out Miles' incredibly stupid malapropisms, his dumbass shortcomings of trying to cover up his murders, and inability to think of a good idea all by himself to uncover the mystery, practically giving Miles a "The Reason You Suck" Speech in total elegance. And he makes this summation and exposes Miles within about half an hour of Miles killing Duke. Blanc works fast once he has enough facts.
How Miles is ultimately beaten. Helen decides to get drunk and goes on a rampage through Miles' art collection in a Tranquil Fury, smashing multiple glass objects, including the bar, while a smug Miles watches on unfazed. But then, the other Disruptors start joining in and destroying more and more things, which starts getting Miles angry. Then, Helen snatches Miles' lighter to start a fire to throw things into. Then, she throws the chunk of Klear Blanc had slipped to her into the fire, causing it to set off the hydrogen gas in the air vents and cause a massive explosion that torches the whole mansion. Then, she uses the override Miles has installed in The Mona Lisa's security system to expose it to the fire, destroying it and turning Miles into a ballistic mess, with his company set to go under for the destruction of the world's most famous painting.
Helen: Your "fuel of the future" just barbecued the world's most famous painting, you dumbass. Congratulations on the public launch of Klear, and the end of Miles Bron. You're ruined. And you did get your wish. To forever be remembered in the same breath... as the Mona Lisa.
The remaining Disruptors turning on Miles by deciding to testify against him in court.
Birdie: I saw the napkin he burned. Claire: God, now that you mention it, I clearly saw him grab Duke's gun. Lionel: I saw him driving away from Andi's house the night she was killed. Miles: Oh... you shitheads.
