TRADE 2/21, 310puts - AAPL - Stoch. Osc. signals downside

It is rare for %K on stochastic oscillator to move between 80-20 in 2-3 candles (days). This happened with AAPL, and it is - in my opinion - an ignored indicator of a pending move up or down. This morning was a great time to buy puts for a swing trade, when stock was 322-323. There is still time to enter, as 30m RSI is still over 50.
You can also see weekly chart. Last week's candle was quite bearish and this bounce up is on lower volume, a "reflex jerk" from the first quick move down.