Since 2008 based on the charts, Brent crashed (75% fall from it's recent structural high & without 61.8% retracement on its way down) three times. On average Brent crashed from its recent high 75% every 4 years.
Each time of the crash, the price of the oil rallied at least 62%.
Actionable : when Brent falls & crashed again within the next 4-6 years, do not forget to be involved in its rally. Buy some oil company stocks or ETF
extra note : from each crashes, it all came after parabolic rally with average of +218% from its recent structural low. Currently price have rallied 383% from the recent structural low. I am not saying another crash will come soon, perhaps price will make 20-30% correction (reset the rally %) and makes it towards 2013 high or price starts to flatlined.. who knows. There is no need to predict the future.. just act when crash happen