They only 'go out in the open' once they have reached a certain level of seriousness.
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	4	nsubj	4:nsubj	_
2	only	only	ADV	RB	_	4	advmod	4:advmod	_
3	'	'	PUNCT	``	_	4	punct	4:punct	SpaceAfter=No
4	go	go	VERB	VB	VerbForm=Inf	0	root	0:root	_
5	out	out	ADV	RP	_	4	compound:prt	4:compound:prt	_
6	in	in	ADP	IN	_	8	case	8:case	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	8:det	_
8	open	open	ADJ	JJ	Degree=Pos	4	obl	4:obl:in	SpaceAfter=No
9	'	'	PUNCT	''	_	4	punct	4:punct	_
10	once	once	SCONJ	IN	_	13	mark	13:mark	_
11	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	13	nsubj	13:nsubj	_
12	have	have	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	13	aux	13:aux	_
13	reached	reach	VERB	VBN	Tense=Past|VerbForm=Part	4	advcl	4:advcl:once	_
14	a	a	DET	DT	Definite=Ind|PronType=Art	16	det	16:det	_
15	certain	certain	ADJ	JJ	Degree=Pos	16	amod	16:amod	_
16	level	level	NOUN	NN	Number=Sing	13	obj	13:obj	_
17	of	of	ADP	IN	_	18	case	18:case	_
18	seriousness	seriousness	NOUN	NN	Number=Sing	16	nmod	16:nmod:of	SpaceAfter=No
19	.	.	PUNCT	.	_	4	punct	4:punct	_
