Bah, wrongs happen. Hope he's learned his mistake, if he ever did something bad, or else, learned that you should always be careful around admins. Sometimes they have a bad day, they're still humans.
Though some bumps are more worthy of being kickable than others. When the guy bumps you, you get shot to death, and he doesn't even say sorry, even though he's clearly the responsible of your death, same in melee duels, etc... It's hard to judge thoses cavalry, so i really advise (imho) new players to "spectate" cav players in cRPG, and try out 8 riding skill in native or sp before. Cause yes, it's hard. But when you "learn" in cRPG battle, while actually really bumping down teammates all the way, lancing friends, then it's another story. The best place to learn things is in SP. Else you're actually ruining the fun of the other players whom have played SP before, and find it infuriating that a newbie come and bump them, and think he can play cRPG right now, and will get away with it since he's a new player. The future of cRPG.
I'm pretty sure your friend, apsod, doesn't have any more problems with admins anyway. So, even if there wasn't any mistake from him, the lesson is learned. That's the main point.