What is so complicated to understand? The drone industry as a whole was under rated for years... These companies have been working on moving the industry ahead in a highly regulated field. They were releasing news and yet the stock prices were not following suite. Watch Jeff B discuss how the stock price is not indicative of the value of the company. Same philosophy for Warren.
https://en.wikipedia.org/wiki/Mr._Market
https://www.youtube.com/watch?v=msFwJ5xpg_g&ab_channel=BloombergMarketsandFinance