Crack

From Shadow Unit Wiki

The damage specific to a person which allows the Anomaly to affect him/her. Cracks seem to be primarily psychological in nature, although severe physical trauma coupled with psychological strain has also been known to bring about a manifestation. Fanaticism is a potential crack.

Quote

"So we're looking for someone with a mad on for smokers?"

Reyes pursed his lips. "Breathing problems themselves?"

"The crack the anomaly got through," Falkner said.

"The crack?" Worth said. She looked like a spectator at a tennis match.

"Stressors apply here, just as they do with other serial crimes." Reyes sounded like a lecturer with sixty seconds before the end of class. "That could be the weakness that allowed the anomaly a foothold."

"Like your immune system failing to protect you from a cold virus when you're tired," Lau added.

--Worth learns a new bit of jargon, from the episode Breathe[1]