Guards from all the other yards responded. This made the other yards short on staff. The procedure when that happens is to lock all the inmates in their cells until the full complement of staff returns. That may take a while, because the staff who responded to the incident now have to full out paperwork attesting to what they witnessed when they ran over there. And if you know how much humans LOVE filling out paperwork, you know they'll drag their feet.
So that's how Mothers' Day started. Hopefully the program will return to normal before nightfall, so I can call my mom and wish her a happy Mothers' Day.