it follows the blair witch formula for an hour , in which we 're told something creepy and vague is in the works , and then it goes awry in the final 30 minutes . 
(ROOT (S (S (NP (PRP it)) (VP (VBZ follows) (NP (DT the) (NN blair) (NN witch) (NN formula)) (PP (IN for) (NP (NP (DT an) (NN hour)) (, ,) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (PRP we)) (VP (VBP 're) (VP (VBN told) (SBAR (S (NP (NP (NN something)) (ADJP (JJ creepy) (CC and) (JJ vague))) (VP (VBZ is) (PP (IN in) (NP (DT the) (NNS works)))))))))))))) (, ,) (CC and) (S (ADVP (RB then)) (NP (PRP it)) (VP (VBZ goes) (ADVP (RB awry)) (PP (IN in) (NP (DT the) (JJ final) (CD 30) (NNS minutes))))) (. .)))
(ROOT (S (S (NP (PRP )) (VP (VBZ ) (NP (DT ) (NN ) (NN ) (NN )) (PP (IN ) (NP (NP (DT ) (NN )) (, ) (SBAR (WHPP (IN ) (WHNP (WDT ))) (S (NP (PRP )) (VP (VBP ) (VP (VBN ) (SBAR (S (NP (NP (NN )) (ADJP (JJ ) (CC ) (JJ ))) (VP (VBZ ) (PP (IN ) (NP (DT ) (NNS )))))))))))))) (, ) (CC ) (S (ADVP (RB )) (NP (PRP )) (VP (VBZ ) (ADVP (RB )) (PP (IN ) (NP (DT ) (JJ ) (CD ) (NNS ))))) (. )))