"Eve hasn't said what triggers them, if she knows, but most of the time she gets this far away look of concentration, like she's trying to remember something and not long after that they start." John answered, wishing he knew more. "I think she's trying to push past whatever's blocking her memory when that happens."

ooc- Stupid lj never sent me a notif on this one and I'd forgotten it. Sorry to leave Snake hanging here.