Couple of things
1- invis is a pretty nooby thing to do in the crucible (it can be fun, but the point still remains)
2- hiding is essentially camping, camping is pretty nooby as well
3- if you know he is going to come after you, why the -blam!- would you hide in the same damn room you killed him in? You know that's where he's going to start. You could have went to the next room and killed him again when he entered the previous one. Pretty nooby mistake.
So the way I see it, he gets one noob point for the blind smash, but gets negative .25 points for getting the kill. You get 2 noob points, .5 for the invis (cause it is fun after all), .5 for hiding, and a full point for staying in the same location knowing he would be back. Congrats, you out noobed the nooby thing you chose to complain about on the forum!