Games : What is the Detonator's "flare explosion" and how do I perform one?

On the Detonator's wiki page, it says the following under base damage:

I know that the 30 damage is achieved when the detonator is a direct hit, and the 10-20 damage is achieved when the flare is manually detonated (the damage depending on the distance from the detonated flare to the enemy), but what is a flare explosion?

The wiki page provides no more information than simply "flare explosion: 56 [damage]", so what is a flare explosion, and how do I use one on an enemy?