I didn't get something from episode 9 "Spy in the House of Love"

This is from a conversation between Echo and Dominic:
Echo-"I needed one еще sign to Подтвердить my suspicion."
Dominic-"And what sign would that be?"
Echo-"20 секунды назад Ты have snapped Charles"
Who is Charles? What did she mean by this?? Don't get it at all.