It asked there forward fell if `` himself , of boulders .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 It)) (VP_4 (ATVP_1 (VBD_0 asked) (RB_1 there)) (VP_5 (ATVP_3 (ATVP_2 (ATVP_0 (ADVP_0 (RB_0 forward)) (VBD_2 fell)) (PP_0 (ATPP_0 (IN_2 if) (TICK_0 ``)) (NP_1 (PRP_0 himself)))) (COMMA_0 ,)) (PP_0 (IN_1 of) (NP_4 (NNS_1 boulders)))))) (DOT_0 .)))