An opportunity to buy CrowdStrike's stock at a safe point hasn't emerged yet.Ever since the IT outage that CrowdStrike (CRWD 0.16%) caused, its stock has been plummeting. Many investors may be wondering when the sell-off is over, as they'd like to use this weakness to buy more shares at cheaper prices.However, this same cohort (I'm included) is also worried about catching a falling knife. Investors use this phrase to describe a situation when a stock is plummeting, as if you catch the knife on the wrong par ...