In the last of our three part series of video highlights from Disrupt SF, we focus on Wednesday when YourMechanic won the Startup Battlefield competition. Earlier in the day, Uber CEO Travis Kalanick explained how he goes up against regulators trying to block his disruptive business model. Yammer CEO David Sacks was asked whether his company was ever in serious acquisition talks with Salesforce or Twitter before it was sold to Microsoft for $1.2 billion. And Vinod Khosla of Khosla Ventures explained why he doesn't like to refer to himself as a venture capitalist, preferring to be called a mentor instead. Seven Disrupt Battlefield finalists were called back on stage to present and take questions during the final round of the competition. Finalists included Expect Labs, Gyft, Lit Motors, Prior Knowledge, Saya, YourMechanic, and Zumper. You can watch each of their presentations below. You can view the video highlights from Monday (Day 1) here and Tuesday (Day 2) here.