then with a shout the dancers rushed out ; a troupe of young boys and girls all dressed in the same blue and white stripes , with red shoes and red caps , in a snaking line , the leader kicking out to the sides with each jump that took the line forwards in a series of leaps and fallbacks , kicks and backheels , weaving the line over and under itself , taking it between the raised arms of a couple , or over their hands laid for a moment on the floor ; restlessly coiling , twisting , turning , and all to the same fast , stamping beat .