a surfers They sounded sudden than piled to attention .
(ROOT_0 (S_0 (ATS_3 (NP_1 (NP_6 (DT_0 a) (NNS_1 surfers)) (SBAR_0 (S_1 (NP_1 (PRP_0 They)) (VP_5 (VBD_0 sounded) (ADJP_0 (JJ_1 sudden) (PP_1 (IN_1 than))))))) (VP_4 (VBD_2 piled) (S_2 (VP_0 (TO_0 to) (VP_1 (NN_3 attention)))))) (DOT_0 .)))