Those who were tripped were then crushed by the wave of people behind them.
1	Those	that	PRON	DT	Number=Plur|PronType=Dem	7	nsubj:pass	4:nsubj:pass|7:nsubj:pass	Discourse=joint-sequence_m:12->9:1|Entity=(23-person-giv:act-cf1*-7-disc
2	who	who	PRON	WP	PronType=Rel	4	nsubj:pass	1:ref	Discourse=elaboration-additional:13->12:0
3	were	be	AUX	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	4	aux:pass	4:aux:pass	_
4	tripped	trip	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	1	acl:relcl	1:acl:relcl	_
5	were	be	AUX	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	7	aux:pass	7:aux:pass	Discourse=same-unit_m:14->12:1
6	then	then	ADV	RB	PronType=Dem	7	advmod	7:advmod	_
7	crushed	crush	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	0:root	_
8	by	by	ADP	IN	_	10	case	10:case	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	10:det	Entity=(27-person-new-cf2-2-sgl
10	wave	wave	NOUN	NN	Number=Sing	7	obl:agent	7:obl:agent	_
11	of	of	ADP	IN	_	12	case	12:case	_
12	people	person	NOUN	NNS	Number=Plur	10	nmod	10:nmod:of	_
13	behind	behind	ADP	IN	_	14	case	14:case	_
14	them	they	PRON	PRP	Case=Acc|Number=Plur|Person=3|PronType=Prs	10	nmod	10:nmod:behind	Entity=(23-person-giv:act-cf1*-1-coref)27)23)|SpaceAfter=No
15	.	.	PUNCT	.	_	7	punct	7:punct	_
