Someone with a mind for physics and mathematics can calculate how far away these spectators were . . . given that the Russians launch from BF nowhere, it’s not too likely anyone was at risk.
About 1.5 miles. Sound was about 8 seconds later than eyeballs.
Look up "The Nedelin Catastrophe". Launch safety was something the Soviets had to learn the hard way. Well, ego maniacs had to think twice about, any way.
General Nedelin had an ego that wrote a check that dozens of people paid for with their lives.