Hellfest Open Air 2014

Matt Heafy, member of the US group Trivium, gestures as he performs during a concert at the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.

Paolo Gregoletto, member of the US group Trivium, performs during a concert at the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.

Heavy metal fans pose for a photograph during the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.

Heavy metal fans attend a concert during the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.

Heavy metal fans attend a concert during the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.

A heavy metal fan poses for a photograph during the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.

An aerial picture shows people at a concert during the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.

Joel Grind, member of the US band Toxic Holocaust, performs on the stage of the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.

Philthy Gnaast, member of the US band Toxic Holocaust, performs on the stage of the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.

A heavy metal fan poses during the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.

Heavy metal fans gesture during the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.

Heavy metal fans attend the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.

Heavy metal fans gesture during the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.

Heavy metal fans gesture during the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.

A heavy metal fan poses during the Hellfest Heavy Music Festival on June 20, 2014 in Clisson, western France.