Long Term Buy and Hold

It's fine being a 'long term buy and hold' investor generally but with events like this you have to know when to sell. I told myself this would potentially be a time to sell (yesterday) a long time ago but I didn't do it. I have to promise myself that if an event like this comes around in the future I will sell before the drop.

I mean there's no point being buy and hold forever because eventually I'll die and need to sell at some point anyway.