In the apt description of one witness, It drops below the radar screen and it's just continually hovering in your imagination; you don't know where it is or what happens to it.
( ( ( ( ( ( ( In ( ( the ( apt description ) ) ( of ( one witness ) ) ) ) ( , ( It ( drops ( below ( the ( radar screen ) ) ) ) ) ) ) and ) ( it ( ( 's just ) ( continually ( hovering ( in ( your imagination ) ) ) ) ) ) ) ; ) ( you ( ( do n't ) ( know ( ( ( where ( it is ) ) or ) ( what ( happens ( to it ) ) ) ) ) ) ) ) . )
(ROOT (S (S (S (PP (IN In) (NP (NP (DT the) (JJ apt) (NN description)) (PP (IN of) (NP (CD one) (NN witness))))) (, ,) (NP (PRP It)) (VP (VBZ drops) (PP (IN below) (NP (DT the) (NN radar) (NN screen))))) (CC and) (S (NP (PRP it)) (VP (VBZ 's) (ADVP (RB just)) (VP (ADVP (RB continually)) (VBG hovering) (PP (IN in) (NP (PRP$ your) (NN imagination))))))) (: ;) (S (NP (PRP you)) (VP (VBP do) (RB n't) (VP (VB know) (SBAR (SBAR (WHADVP (WRB where)) (S (NP (PRP it)) (VP (VBZ is)))) (CC or) (SBAR (WHNP (WP what)) (S (VP (VBZ happens) (PP (TO to) (NP (PRP it)))))))))) (. .)))
And in that moment, a sudden realization sets in, and your stomach starts to sink.
( And ( ( in ( that moment ) ) ( , ( ( ( ( ( ( a ( sudden realization ) ) ( sets in ) ) , ) and ) ( ( your stomach ) ( starts ( to sink ) ) ) ) . ) ) ) )
(ROOT (S (CC And) (PP (IN in) (NP (DT that) (NN moment))) (, ,) (S (NP (DT a) (JJ sudden) (NN realization)) (VP (VBZ sets) (PRT (RP in)))) (, ,) (CC and) (S (NP (PRP$ your) (NN stomach)) (VP (VBZ starts) (S (VP (TO to) (VP (VB sink)))))) (. .)))