I do know swinging baseball bats indoors is bad. But no one ever told me not to shoot indoors when I was a child.
I'm working on a membership to an outdoor range. Funny thing is with the purpose-built lighting system in the indoor range, chances are that the outdoor one will have better lighting on any given day.
In that case my concerns may not be an issue any longer if shoot outdoors mostly. But we'll see, that muzzle flash was a really rich orange color - not like an afterimage where you're wondering if it was there or not.