Paris Saint-Germain's Spanish coach Unai Emery. Pic/AFP

Barcelona: PSG coach Unai Emery was fighting for survival Thursday after his side were swept away 6-1 by Barcelona in a Champions League rout described as a "nightmare" and a "humiliation". The Spaniard had been hailed as a tactical genius last month when his French champions stunned mighty Barca 4-0 in Paris in the first leg of their last-16 tie.