>>2 She gave you no detail to believe that it wasn't a big deal. "Blocking" someone doesn't stop them from transferring pics, vids, slander, info or anything they might have to everyone else nor does it block them if they change their profile/number/ID/etc. Of course the subject isn't actually the bully nor the victim in this case, but bystander OP.
>>1 Expulsion is a pretty lofty punishment in most cases, so was the bullying severe enough to warrant it? Was there any other punishment they received instead? I don't know the details obviously, but has your friend gotten better? It's easy to get caught up in reciprocating something an eye for an eye, but which is really more important, their punishment or your friend's happiness. And come to know that they can never truly be one-and-the-same.