Look again: The first big biter obfuscates it, but it seems damage from fire actually is rather significant.Hannu wrote: It seems that flamethrower is pretentious toy with no practical use in military operations if enemies sensitivity to fire is not increased by an order of magnitude or more. At least in showed video flame thrower has practically no health effect to large biters. They would have killed player after couple of seconds and fire did not kill any of them. And that was not a large swarm.
The reason is doesn't affect that first obvious biter so much is that its able to cross the fire patch before taking much damage. The others caught in the flame die quite quickly, as can be seen by looking at the ones running across bottom of the image.