 No, he is a hijack.
( No ( , ( he ( ( is ( a hijack ) ) . ) ) ) )
(ROOT (S (INTJ (UH No)) (, ,) (NP (PRP he)) (VP (VBZ is) (NP (DT a) (NN hijack))) (. .)))
It is a hijacking.
( It ( ( is ( a hijacking ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (NP (DT a) (NN hijacking))) (. .)))