whenever it threatens to get bogged down in earnest dramaturgy , a stirring visual sequence like a surge through swirling rapids or a leap from pinnacle to pinnacle rouses us . 
(ROOT (S (SBAR (WHADVP (WRB whenever)) (S (NP (PRP it)) (VP (VBZ threatens) (S (VP (TO to) (VP (VB get) (VP (VBN bogged) (PRT (RP down)) (PP (IN in) (NP (JJ earnest) (NN dramaturgy)))))))))) (, ,) (NP (NP (DT a) (VBG stirring) (JJ visual) (NN sequence)) (PP (IN like) (NP (NP (NP (DT a) (NN surge)) (PP (IN through) (NP (VBG swirling) (NNS rapids)))) (CC or) (NP (NP (DT a) (NN leap)) (PP (IN from) (NP (NN pinnacle))) (PP (IN to) (NP (NN pinnacle))))))) (VP (VBZ rouses) (NP (PRP us))) (. .)))
(ROOT (S (SBAR (WHADVP (WRB )) (S (NP (PRP )) (VP (VBZ ) (S (VP (TO ) (VP (VB ) (VP (VBN ) (PRT (RP )) (PP (IN ) (NP (JJ ) (NN )))))))))) (, ) (NP (NP (DT ) (VBG ) (JJ ) (NN )) (PP (IN ) (NP (NP (NP (DT ) (NN )) (PP (IN ) (NP (VBG ) (NNS )))) (CC ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN ))) (PP (IN ) (NP (NN ))))))) (VP (VBZ ) (NP (PRP ))) (. )))