Bullying 2.0

So one of my kids has been walking around with a weird bandage on his stomach. He gets all vague and weird about it when an adult asks him, but he's holding court with the other kids giving details about whatever happened.
On Thursday, I walked up to him and asked him what happened. He hemmed and hawed and just kept saying he was okay. I told him he needed to be ready to tell me the whole truth on Friday.
Well, Friday comes around. He came up to me and said, "I'm ready to tell you now." We go into the hallway, and he tells me that over Christmas break, some high school boys had been following him and showing knives. They tried to rob him, but he fought back and "something happened" to his stomach. He said that on the way to school that day, they had followed him again and told him they would kill him and "put you in the vacants (houses)" He said he recognized the faces but he "doesn't think" he knows the names of these kids. It might be some of the kids who went to our school last year, it might not.
The whole conversation was filled with him evading answers and mumbling. He's afraid if he snitches on them, he'll get even more crap from them. Well, guess what. I get paid to snitch.
So I went to one of the ISTs (because her room is close to mine) and told her what was going on. I asked her to go tell Principal so we could do something about it. Principal called the school police and they took the kid up to their office and asked him about it. He told them everything (as far as I know.) We ended up calling his mother to come pick him up (so he wouldn't see the kids after school.)

We solved the problem for that moment, but I wish there was something more. It's a fine line to walk for me, because I want the kids to feel comfortable enough to share information with me, but I can't always keep their secrets.

Part of me knows that this one is still a kid and no matter how tough he acts, he told me the truth because he wanted me to do something about it. But I also know how scared they are of these assholes that bully and terrorize them.

I want to feel like I helped and did something good, but at the same time, I want to cry because it's not fair that this stuff happens in the first place.