The 'Backtalk' mechanic is unique to Life is Strange: Before the Storm and represents Chloe's rebellious nature and sharp wit. During certain dialogue encounters, instead of traditional dialogue choices, you'll enter a 'Backtalk' challenge. This is a timed sequence where you must choose the correct responses to win an argument or convince someone to do what you want.
Each Backtalk challenge presents a series of prompts, and you need to select the most effective retort from a limited set of options. The key is to listen carefully to what the other person is saying and choose a response that either refutes their point, uses their own words against them, or appeals to their emotions. There's a 'strength' meter that indicates how well you're doing; filling it up before time runs out or you run out of attempts means you win the Backtalk. Failing a Backtalk can lead to different outcomes, sometimes negative, sometimes simply a different path in the narrative. It's a high-stakes dialogue system that truly embodies Chloe's character, so pay attention to the context and choose your words wisely!