Perhaps being shot in the head by the perp had a teensy impact on how long he thought he should wait before returning fire.
And perhaps being held responsible for his actions will have a teensy effect on his temper.
The Glock in a holster inside his briefcase did not allow him to respond to the threat immediatly. Maybe had he drawn his weapon at the get-go, he wouldn't have hit the bystander. Hope he learned how useless his sidearm is when its tucked away in a briefacse.
Needless to say, his response was wreckless and could have killed innocent people. A target shooter should always KNOW where his shots are going to go. He missed his opportunity for self defense. What he did was "apprehend" the perp and injured an innocent in the process. Normally I applaud those who defend themselves..but not in this case.