Yeah sure, but on a spike down like this on news that isn't a fundamental weakness, the spike back up again when the news has cleared can be just as sharp. Sure, this will be a rolling issue with potential for more spikes even lower, but eventually it will settle and reach all time highs again. So a sound strategy in this case is to buy any dip and hold, or multiple buys on multiple dips. Just as long as you're not trying to do it on CFD's or a margin loan, then the falling knife issue isn't a problem.