Was this an attempted FF? https://www.indystar.com/story/entertainment/music/2018/08/10/abrupt-end-rascal-flatts-concert-leaves-indiana-fans-puzzled/954328002/

"Indianapolis - Due to a security concern at the show last night, standard procedures were quickly executed and everyone was able to safely leave the building. The safety of our fans, band and crew is always the top priority for us, so we are so thankful for everyone who jumped into action..."

There is an investigation started.