"I got swatted", he says when he returns to the stream.
Swatting is the extremely risky practice of making a false report of current or imminent violence to the police, causing them to show up at a location armed and prepared for a confrontation.
Giersdorf returned to the stream, telling friends, "They came in with guns, bro".
"To the individual who attempted to have our home swatted and could have possibly gotten someone injured in the process, I don't hate you", he said.
Caught up in Fortnite's frantic pace, Miller and Walsh didn't register what Gierdorf had said, leaving them to wonder why he appeared to have abandoned them in the middle of a game. "That's scary. The internet's f-- insane".
In a second video, Geirsdorf retells what happens and explains why he was lucky.
Thankfully, this particular situation was quickly defused because one of the officers attending the incident lives in Bugha's neighbourhood and recognised the teen.
Werner said the entire incident only lasted about a half-hour, but involved lots of resources.
The Upper Pottsgrove Township Police Department did not immediately respond to a request for comment from NBC News.
Swatting has had lethal consequences in the past.
In March, Los Angeles resident Tyler Barriss was sentenced to 20 years in prison for his role in a 2017 swatting incident in Witchita, Kansas, that left a 28-year-old father of two dead after he was shot by a police officer.
It is not known what the swatter told police when they made their false report. Police arrived at the address and, believing there to be an active shooter, killed the person who came to the door, believing he was reaching for a weapon.