At 9:57, the passenger assault began.
( ( At 9:57 ) ( , ( ( the ( passenger assault ) ) ( began . ) ) ) )
(ROOT (S (PP (IN At) (NP (CD 9:57))) (, ,) (NP (DT the) (NN passenger) (NN assault)) (VP (VBD began)) (. .)))
The passengers were too scared to fight back.
( ( The passengers ) ( ( were ( too ( scared ( to ( fight back ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS passengers)) (VP (VBD were) (ADJP (RB too) (VBN scared) (S (VP (TO to) (VP (VB fight) (ADVP (RB back))))))) (. .)))