His job had been to protect Peter, not to follow Stillman.
1	His	he	PRON	P3SG-GEN	Gender=Masc|Number=Sing|Person=3|Poss=Yes|PronType=Prs	2	nmod:poss	_	_
2	job	job	NOUN	SG-NOM	Number=Sing	6	nsubj	_	_
3	had	have	AUX	PAST	Mood=Ind|Tense=Past|VerbForm=Fin	6	aux	_	_
4	been	be	AUX	PERF	Tense=Past|VerbForm=Part	6	cop	_	_
5	to	to	PART	_	_	6	mark	_	_
6	protect	protect	VERB	INF	VerbForm=Inf	0	root	_	_
7	Peter	Peter	PROPN	SG-NOM	Number=Sing	6	obj	_	SpaceAfter=No
8	,	,	PUNCT	Comma	_	11	punct	_	_
9	not	not	PART	NEG	_	11	advmod	_	_
10	to	to	PART	_	_	11	mark	_	_
11	follow	follow	VERB	INF	VerbForm=Inf	6	conj	_	_
12	Stillman	Stillman	PROPN	SG-NOM	Number=Sing	11	obj	_	SpaceAfter=No
13	.	.	PUNCT	Period	_	6	punct	_	_
