I would imagine there is plenty of time from the moment you hear the ults to run inside/under map structures where Seven cant hit you from the sky and Ivy has a hard time flying, if she can follow at all.
I managed to catch a recording of it happening with a replay software. Up until the recording starts there were no audio issues so far during the game.
You can also see hero portraits when healing and killing sometimes are blank, this also happens only after I get the audio bug.
Relevant...