[GAMEPLAY] Super knockup when Darius pulls enemy inside of Vel koz knockup

I was playing Hexakill as Darius(lord Darius skin) and with me Vel koz(arclight skin) i then grabbed 2 enemies at the edge of the Vel koz knockup and suddendly they flew out of sight for around 3-4 sec. Since the combo is quite hard to make and i was not sure whos spell was first we couldn`t repeat this bug.

1. I think its first Vel koz knockup in front of Darius
2. Darius grabs enemy from middle to the edge of the knockup
3. watch your enemies flying away

maybe i already had Tiamat or Titanic Hydra as item if thats important

I don`t know if this bug was already found or it is old but i thought ill just post it here in case nobody else did (btw sry for bad english)