for most of the film it is hard to tell who is chasing who or why 
(ROOT (S (PP (IN for) (NP (NP (JJS most)) (PP (IN of) (NP (DT the) (NN film))))) (NP (NP (PRP it))) (VP (VBZ is) (ADJP (JJ hard)) (S (VP (TO to) (VP (VB tell) (SBAR (SBAR (WHNP (WP who)) (S (VP (VBZ is) (VP (VBG chasing) (NP (WP who)))))) (CC or) (WHADVP (WRB why)))))))))
(ROOT (S (PP (IN ) (NP (NP (JJS )) (PP (IN ) (NP (DT ) (NN ))))) (NP (NP (PRP ))) (VP (VBZ ) (ADJP (JJ )) (S (VP (TO ) (VP (VB ) (SBAR (SBAR (WHNP (WP )) (S (VP (VBZ ) (VP (VBG ) (NP (WP )))))) (CC ) (WHADVP (WRB )))))))))