That was my perception too. At first, I was thinking that some of the media were using their mikes to magnify the counter-protestors' shouts, maybe not, but I wouldn't be surprised...the shouting was too loud just for that small group of antis.
I did see some bullhorns back there later.
I saw at least one bullhorn with one of the pro-illegals and I wondered if there were more. In the future, the police should not allow that. But then, it shouldn't have been allowed this time either!