His heels clicked together.
( ( His heels ) ( ( clicked together ) . ) )
(ROOT (S (NP (PRP$ His) (NNS heels)) (VP (VBD clicked) (ADVP (RB together))) (. .)))
His heels did not touch together.
( ( His heels ) ( ( ( did not ) ( touch together ) ) . ) )
(ROOT (S (NP (PRP$ His) (NNS heels)) (VP (VBD did) (RB not) (VP (VB touch) (ADVP (RB together)))) (. .)))