Unintended Apollo+Dynamo Ult Interaction?

[thatguyqueso]

Apparently, an enemy Apollo can make Dynamo Ult extend past its displayed duration and remain active while he is able to move after its supposed to end. This makes it last for around ~1 second longer than normal at base and possibly longer with duration upgrades, clip below to show

 

[van17ino6]

Yeah this happens! This is due to Apollo's ult "slowing time" for affected heroes. It's stated on the ult tooltip.
I would assume this also happens with Paradox' third ability.

I personally don't know astrophysics or Ixian magic so I'm in no position to categorize this as bug or feature...