invincibility

i noticed that in the 1.2 outline and obviously the newest update on the homepage, there is a halo and a 5 second durability, so i was wondering if we will still be able to hit them while theyre inivincible.... for example sum1 was just killed and respawns and u do a 3-hit combo on them, during...

Well, as everyone knows, spamming the spawn points has become a big problem on maps such as afm, so how about it? (Sorry if its been suggested before, but i couldnt find anything about it)