The difference is when the cat hisses, that means they are annoyed and they want the other cat to go away.
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	2:det	_
2	difference	difference	NOUN	NN	Number=Sing	10	nsubj:outer	10:nsubj:outer	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	10	cop	10:cop	_
4	when	when	ADV	WRB	PronType=Int	7	advmod	7:advmod	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	6:det	_
6	cat	cat	NOUN	NN	Number=Sing	7	nsubj	7:nsubj	_
7	hisses	hiss	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	10	advcl	10:advcl:when	SpaceAfter=No
8	,	,	PUNCT	,	_	10	punct	10:punct	_
9	that	that	PRON	DT	Number=Sing|PronType=Dem	10	nsubj	10:nsubj	_
10	means	mean	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	0:root	_
11	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	13	nsubj	13:nsubj	_
12	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	13	cop	13:cop	_
13	annoyed	annoyed	ADJ	JJ	Degree=Pos	10	ccomp	10:ccomp	_
14	and	and	CCONJ	CC	_	16	cc	16:cc	_
15	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	16	nsubj	16:nsubj	_
16	want	want	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	13	conj	10:ccomp|13:conj:and	_
17	the	the	DET	DT	Definite=Def|PronType=Art	19	det	19:det	_
18	other	other	ADJ	JJ	Degree=Pos	19	amod	19:amod	_
19	cat	cat	NOUN	NN	Number=Sing	16	obj	16:obj|21:nsubj:xsubj	_
20	to	to	PART	TO	_	21	mark	21:mark	_
21	go	go	VERB	VB	VerbForm=Inf	16	xcomp	16:xcomp	_
22	away	away	ADV	RB	_	21	advmod	21:advmod	SpaceAfter=No
23	.	.	PUNCT	.	_	10	punct	10:punct	_
