So i've gotten to the last step which is to kill an invader before they kill anyone. Now i know you have to kill them within like 10 seconds. But even when they just spawned and i'm the first person they see, and i kill them, i don't get the checkmark. At first i thought maybe he killed someone without me knowing so okay. But then when i got the second kill i knew it was under 10 seconds, maybe even under 5. And they absolutely did NOT kill anyone because i was the first they ran into. I killed him and nothing happened. I think it's some kind of bug and would like to get some feedback on this. Please.