On Dec. 24, 2014, a man’s life was saved after he suffered a heart attack during a school performance in Helena, Mont. Luckily, off-duty medical professionals were attending the performance. By the time police arrived, the off-duty medical professionals had administered CPR, used an AED, and had revived the heart attack victim.

The AED belonged to the school. Prior to the incident, it had never been used.

According to Jefferson County Sheriff Deputy Tom Grimsrud, the victim was saved by the medical professionals who attended the concert. If the professionals had not administered CPR and used the AED, then it is possible the victim would not have been saved.

After the heart stops, it must be restarted within five to six minutes. The victim’s heart was restarted within two minutes thanks to the AED.