Of course he didn't listen. Barda was running into danger and she expected him to hide? Scott Free never ran from battle!
Wait not... no it was the opposite of that. He pretty much tried to avoid battle whenever possible.
But, given that his lovely assistant was wading waist deep in parademons, he couldn't exactly make a gallant dash for it this time.
"Hey! Stop that!" Scott yelled at the parademons below, darting in and out of laser fire and trying to keep their attention on him, rather than the fleeing audience members. And... strangely enough... Barda. Why were they attacking Barda? Didn't they recognize her as Darkseid's favored Fury, the likes of whom had never been seen before on Apokolips? The warrior whose strength and prowess in battle was matched only by Granny Goodness or Darkseid himself?
Didn't Darkseid's favor give her some measure of protection from them?
Scott turned to look towards Barda, his frown deepening- but he paid for his distraction with a laser strike cutting across his shoulders, singing his skin and tearing his costume: his quick reflexes alone saved him from being much, much more seriously injured.
Scott fell for a moment, then regained his balance and swooped out of the line of fire, two parademons charging him from different directions. Mister Miracle sprung higher into the air, twisting and spinning, his cape flying out around him and disguising his actual location-- confusing the dull witted parademons into flying straight into each other and falling out of the sky.
He was just starting to feel better about the whole situation when he saw the old man bleeding and rocking. Scott moved to him quickly-- but cautiously-- and reached out a compassionate hand towards his shoulder. "Sir? Sir, are you alright? You're bleeding. We need to take you to the hospital."