He was defeated by the alerted, unarmed passengers of United 93.
( He ( ( was ( defeated ( by ( ( the ( alerted ( , ( unarmed passengers ) ) ) ) ( of ( United 93 ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD was) (VP (VBN defeated) (PP (IN by) (NP (NP (DT the) (JJ alerted) (, ,) (JJ unarmed) (NNS passengers)) (PP (IN of) (NP (NNP United) (CD 93))))))) (. .)))
The person was beat down by the people on the plane.
( ( The person ) ( ( was ( ( beat down ) ( by ( ( the people ) ( on ( the plane ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN person)) (VP (VBD was) (VP (VBN beat) (PRT (RP down)) (PP (IN by) (NP (NP (DT the) (NNS people)) (PP (IN on) (NP (DT the) (NN plane))))))) (. .)))