Annabelle's uncanny luck may be extending to Ellen at the moment, because that instant is when the two guards' patrol takes them on a path that will quickly lead to them facing the other way.
"Wait 5 seconds, then go," Annabelle says. "Their path should have them facing away from you by then."
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"Wait 5 seconds, then go," Annabelle says. "Their path should have them facing away from you by then."