Possibly they got to see some of their partners shot to pieces in the rounding-up process.
Notice all the guards are armed, and the prisoners are passing through the gauntlet.
In our corrections systems, most of the correctional officers check in their firearms when they are working closely with the prisoners. These guards look prepared to splatter some sub-humans, and the animals seem to be aware of that.
RE: El Salvadorian jails....
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NBC news article from about 10 months ago...
“El Salvador Arrests 6,000 Gang Members In 10 Days”
https://www.youtube.com/watch?v=zwfU2_Gyy94 (about 3 minutes long)
President Bukele is not screwing around!
🐷