That means they are fighting.
1	That	that	PRON	DT	Number=Sing|PronType=Dem	2	nsubj	2:nsubj	_
2	means	mean	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	0:root	_
3	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	5	nsubj	5:nsubj	_
4	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	5	aux	5:aux	_
5	fighting	fight	VERB	VBG	Tense=Pres|VerbForm=Part	2	ccomp	2:ccomp	SpaceAfter=No
6	.	.	PUNCT	.	_	2	punct	2:punct	_
