both grant and hoult carry the movie because they are believable as people -- flawed , assured of the wrong things , and scared to admit how much they may really need the company of others . 
(ROOT (S (NP (CC both) (NN grant) (CC and) (NN hoult)) (VP (VB carry) (NP (DT the) (NN movie)) (SBAR (IN because) (S (NP (PRP they)) (VP (VBP are) (ADJP (JJ believable)) (PP (IN as) (NP (NP (NNS people)) (, --) (ADJP (ADJP (JJ flawed)) (, ,) (VP (VBN assured) (PP (IN of) (NP (DT the) (JJ wrong) (NNS things)))) (, ,) (CC and) (ADJP (JJ scared) (S (VP (TO to) (VP (VB admit) (SBAR (WHADVP (WRB how) (JJ much)) (S (NP (PRP they)) (VP (MD may) (ADVP (RB really)) (VP (VB need) (NP (NP (DT the) (NN company)) (PP (IN of) (NP (NNS others))))))))))))))))))) (. .)))
(ROOT (S (NP (CC ) (NN ) (CC ) (NN )) (VP (VB ) (NP (DT ) (NN )) (SBAR (IN ) (S (NP (PRP )) (VP (VBP ) (ADJP (JJ )) (PP (IN ) (NP (NP (NNS )) (, ) (ADJP (ADJP (JJ )) (, ) (VP (VBN ) (PP (IN ) (NP (DT ) (JJ ) (NNS )))) (, ) (CC ) (ADJP (JJ ) (S (VP (TO ) (VP (VB ) (SBAR (WHADVP (WRB ) (JJ )) (S (NP (PRP )) (VP (MD ) (ADVP (RB )) (VP (VB ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NNS ))))))))))))))))))) (. )))