After Metal Head does an easy job with Heavy Duty and the Tri-Blaster, the Incinerators work on smoking Lifeline out of his temporary refuge.   

I army-built all the Blowtorches nobody wanted from the Blowtorch/Snow Serpent two-pack. I think they make great Cobra Incinerators. One of my Blowtorches has a backpack and flamethrower that are the same color as his helmet. Have you come across this variation as well? It's the only one I've seen so far. 

My Metal Head is the Funskool version and didn't come with any backpack or missles. If you have any from the American version for trade, do email me.