So I noticed today that I could barely make it to the final round in colo, then that's when the real problems started. The reason I could barely make it to the final round was because 9/10 times I targeted someone, it kept saying "this target cannot be attacked." Now I figured out (and this is just my theory) that if they have the 5 sec invincible buff (that looks like a blue crystal) that they cannot be attacked. I originally thought that it only meant that they had just spawned and could not be damaged. (someone please confirm this)
Despite all that I managed to make it to the final round, and I could not attack ANYBODY... Are these hacks or bugs? It certainly makes sense that people who are bugged or hackers can make it to the final round but I wasn't so what the heck?