He would manage to wrench his own blade out, the metal edge sliding through Crow's metal gauntlet, however her hold on the leather grip of her own sword remained. With Markus still clutching her blade yet with his back turned, Crow lifted her leg and kicked out, her foot slamming into Markus' back–as, of course, his back was turned. The impact would normally send any normal person to the ground, but as OP stated, Markus probably wasn't a normal person.