He felt the off-hand dagger's weight in the small of his back.
( He ( ( ( felt ( ( the ( off-hand ( dagger 's ) ) ) weight ) ) ( in ( ( the small ) ( of ( his back ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD felt) (NP (NP (DT the) (JJ off-hand) (NN dagger) (POS 's)) (NN weight)) (PP (IN in) (NP (NP (DT the) (JJ small)) (PP (IN of) (NP (PRP$ his) (NN back)))))) (. .)))
The knife was poking into his back.
( ( The knife ) ( ( was ( poking ( into ( his back ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN knife)) (VP (VBD was) (VP (VBG poking) (PP (IN into) (NP (PRP$ his) (NN back))))) (. .)))