The Future of Shorting

We see motorcycles, headline valuations in the US are still very high. Yet we've had a bear market in a whole raft of the market. It's very exciting because you don't get these valuations except at the bottom of bear markets or in the middle of recessions. And so I find this to be a very exciting time. Can we just touch on the short side? You and I have something in common which is we both shorted Tesla and both had to retreat. What have you learned about the world of shorting which has forced a lot of people simply to give up as well?