boulders and shadows was then surfer .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_0 (NP_4 (NNS_1 boulders)) (CC_0 and)) (NNS_0 shadows)) (VP_4 (ATVP_0 (VBD_1 was) (ADVP_0 (RB_0 then))) (NP_6 (NN_3 surfer)))) (DOT_0 .)))