The controversial fiber and copper-network owner was the target of a short report, the second on the company within a week. Shares of Lumen Technologies (LUMN -10.29%) were falling hard on Tuesday, down 9.1% as of 2:23 p.m. EDT. Lumen is a debt-riddled company whose stock became distressed earlier this year. However, an early-year deal to extend its debt maturities, combined with long-term deals for AI (artificial intelligence) networking, caused the stock to skyrocket in early August. But weeks after the s ...