flickering out by its perfunctory conclusion 
(ROOT (S (VP (VBG flickering) (PRT (RP out)) (PP (IN by) (NP (PRP$ its) (JJ perfunctory) (NN conclusion))))))
(ROOT (S (VP (VBG ) (PRT (RP )) (PP (IN ) (NP (PRP$ ) (JJ ) (NN ))))))