that sky mumbled off at Frozen navy .
(ROOT_0 (S_0 (ATS_3 (NP_1 (DT_1 that) (NN_2 sky)) (VP_4 (ATVP_3 (VBD_2 mumbled) (PRT_0 (RP_0 off))) (PP_1 (IN_1 at) (NP_2 (NN_2 Frozen) (NN_3 navy))))) (DOT_0 .)))