Even if it is difficult or you feel it is impossible to talk to him, if you could just go stand with him in a supportive manner. Non threatening. I have had people do that with me before. I could feel their support (if that makes sense) but then I am very sensitive. Sometimes words may not be the best option,
Standing near him is a good idea for showing support if you feel unable to say anything.
It does put you at risk of becoming entangled in a bullying situation, though -- bullies might go after you or the boy in question might be so upset that he thinks you're coming to bully him, too (some of that would depend on timing, I think) or he might just feel so vulnerable that he would want to be alone (that's an individual preference, I have no idea, it's just a possibility)....BUT, I still think it is a good idea and it might work really well.
You could also combine this idea of communicating without words (or at least, without speaking) with the idea that @Isadoorian had about giving him a little first aid kit. You could write something on a sticky note or a piece of paper taped to the case that said something like, "I wish I had this when I saw you cut your knee the other day and the teacher wouldn't let you clean up the cut (that teacher is a jerk, they should have let you go clean it up). Thought maybe you could use it someday. If you ever need a friend, I'm here for you." Then you could just hand it to him without saying anything, and there would be no pressure on him to respond at all.
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