Price of Bitcoin is stable from February.
Stock markets gained a lot from February till today, no matter decreases that happened.
If there will be serious crash money that will be left will leave stocks and move to Gold and also some to Bitcoin.
Actually this migration will started happening before. When Economies will start cool down ( China does) and will get in depression. Stock market follows that.
So price of Bitcoin will start growing much before the big stock bubble crash.
When will that happen? You will see when Bitcoin price start growing.