Do I have the fastest overkill/exterm in Halo 5?

So, this right here is a move that I have been doing for quite some time now, on the maps that allow for it. I never really thought about it until recently, but I’m hitting the overkill/exterm at the 5 second mark on Amnatu’s Angels. So, I think I may have the fastest time from the start of a match to getting the team-wipe. Am I correct in this? The only comparable time I can figure is getting the team-wipe in swat on Truth (though my clip here is only a triple).
I can’t remember if I’ve ever turned one of these into a very-quick naire, but if I have I deleted the clip anyway on my last dvr purge.

Here’s some more of them, mostly on the same map:
http://xboxdvr.com/gamer/Thaddeus%20Hamlet/video/31388244
http://xboxdvr.com/gamer/Thaddeus%20Hamlet/video/35259147
http://xboxdvr.com/gamer/Thaddeus%20Hamlet/video/35259170
http://xboxdvr.com/gamer/Thaddeus%20Hamlet/video/33997979
http://xboxdvr.com/gamer/Thaddeus%20Hamlet/video/34732569