Cybersecurity company Palo Alto Networks (PANW 1.09%) stock flourished earlier this year, with shares reaching a 52-week high of $380.84 on Feb. 9. Then on Feb. 20, the company released results for its fiscal second quarter (ended Jan. 31)  and its stock price promptly plunged.Shares remain well below the 52-week high at the time of this writing. Does this share price drop provide a buying opportunity? Or is this a warning sign not to invest in Palo Alto Networks?To answer that question, it's necessary to e ...