[quote=QuietThinker]
I reckon in a fight like this, they need to be susceptible to physical damage. And unless it's justified, they should only really have a strong resistance to it if they're a melee fighter.You could make it so that they are like the human torch, where they are on fire, but has a physical base. So hitting them would burn them, but it would do real damage to the flame guy.
[/quote]

Okay, I'll change it to that.

However, the flames are hot enough to melt steel, so trying to shoot it with some kind of bullet would fail and trying to hit it with a steel sword or something would fail, or at least, the sword would be practically unusable after.