Hmm. Maybe Anne and Silver end up on the bad side of some tunnel running gangs and Scootaloo ends up running to Rarity or Dash for help?
Or Rarity also has a "enforcer" business on the side? Basically, she rents guards (who are volunteers from her employees) to ponies who she feels won't abuse them for evil purposes.
It would be interesting to see Anne and Silver get involved with the Ravens because they were hired by them.
And maybe Spike can get involved in some asskicking as well. Hey, he's got a Batman Beyond-esque suit and some serious firepower. It'd be a damn shame for him to not use them!