Able to Hold/Shoot your weapon whilst defusing.

I wish I had my clips turned on when it happened, but i have a video from my tm8s POV.

seems I sprinted up with my knife out, attempted to defuse and it pulled my knife out whilst still defusing. I then swapped to my blackout and was able to shoot it whilst defusing. I tried replicating in a custom game but couldnt get it to happen. i believe its something to do with the sprint mechanic with some sort of frame perfect timing.