User blog comment:SethOmega/Bracchidios Discussion/@comment-26074976-20130424205333

This is my theory for the slime.

My idea is that the mould contains a mineral or chemical and the Brachy's saliva has an acid that reacts with the mould. When it punches this causes the activation energy needed, which then speeds the chemical reaction of the saliva and mould making it combust. The punches could just be a catalyst for the explosions to happen.