Redstone dust active for a tick after destroying source of power

Activate redstone dust, then destroy source of it. For a moment it can activate stuff, what it was not possible before 

https://youtu.be/_IL1-sKZeqw <-- this 11 second video show, how it works. It can activete more stuff than just command block, for example TNT.

 

(This post is exacly same as last one, but video show with resource pack/optifine turned off, so it's pure vanilla)