too fast to shoot

Rifle shots here and there, in three round bursts. Fox, Willoby and Doody were firing almost blind. Two of the creatures latched onto Brice as he lay slashed and bleeding, and started to drag him away. A volley smashed through them and they hobbled off into the dark, yowling.
"Christ, they're everywhere," Willoby said.
"I can't get a shot in, boss," Fox shouted. "They're too bloody fast."

Chapter 21, Page 215