Fortnite instant purple shockwave grenade exploit

I was messing around in Fortnite in the extraction zone when it was a rift anomaly where the extraction zones were safe. There was a guy in the bubble with me the purple dome bubble so I used the shockwave grenade on him for fun to see what would happen then realised I could use the impulse grenade again instantly. I did a few tests and every time it has worked so you basically have infinite amounts of impulse grenades to use only inside that safe zone in the extraction site. This is useful cuz you can spam it to extract your sprites and kill the people and get theirs and extract.

I also tried to find any information about this but only ended up finding one small clip of it:
[https://www.youtube.com/shorts/jQILysSSU8A\](https://www.youtube.com/shorts/jQILysSSU8A)

Lmk if this works for ya’ll or if you already knew about this?