if this had been tarchna , they might have ended the evening there , with the dancers joining the guests on their couches ; pure was flirting with one of the youths , but sethre coughed and slid his eyes in the direction of the flint faced faustus , and pure got the point , and shook her head at the dancer , who backtracked , his face studiedly impassive with the same little upturned smile tanaquil so often used to greet bad news .