That's what happened in iwo Jima - if you're an American using a flamethrower, if the Japanese got a chance, they will drag you and beat you to death/slice you up with their katanas and bayonets. Flamethrowers are scary things - you don't need direct contact with the flame to kill you in a building/cave, the suffocation will do it for you... Every soldier that see flamethrowers are used against them will make sure that they are dealt with quickly. For them, it's better to be shot by a bullet than burnt/suffocated to death.
I hope so!