back warily and the group stand his knees .
(ROOT_0 (S_0 (ATS_3 (ATS_4 (ATS_0 (ADVP_0 (RB_0 back)) (ADVP_0 (RB_0 warily))) (CC_0 and)) (S_1 (NP_0 (DT_0 the) (NN_2 group)) (VP_5 (VB_0 stand) (NP_3 (PRPDOLLAR_0 his) (NNS_0 knees))))) (DOT_0 .)))