"Several" rounds in a half hour? Sounds slower than the average Civil War-era rifle.
Actually, who said this might have been the police themselves and it sounds like the gunman had a hostage so maybe ever so often, he fired out the window. Now, that I read up on other stories, it may well be different than some "sniper copycat" of Las Vegas which it does sound like at first.
A preliminary investigation indicates the shooter was acting alone, he said in a statement. He said the female hostage escaped injury and no one else was seriously hurt.
"This case is actively being investigated, and no additional information will be released at this time," Gallop said. The name of the gunman has not been released.
Reno Deputy Police Chief Tom Robinson told reporters that officers on the scene indicated the suspect who appeared to be in his mid- to late-20s may have been seeing things.
Read more at: https://www.usnews.com/news/best-states/nevada/articles/2017-11-29/police-kill-gunman-with-hostage-in-reno-condo
Again, one might explore this more, I was looking for official statements from the Reno Police Department but it sounds a bit like they are just saying what the police said.