[Willy]

Fire is a force that causes fear in nearly every living being, all known animals try to avoid fire. A will role should be used even if the person is literally completely protected and sealed of from damage. It takes a lot of training and experience to make a firefighter able to enter a house in flames and get there job done, that´s nothing for rookies. Bravery helps of course.

As for the plate armor, nearly all of them have a padded undercloth, not only the gambeson, so yes you can run through a hex or two thats burning like a normal camp fire.

A lot of the early job training for smiths and glas blowers and the like is not to endanger yourself, a glas blower in considered to work unsupervised after 2 years of training. before that he hasn´t enough experience to work safely.

Keep in mind that the actual damage fire does is not the main problem, it´s the fact that burnings are very painfull and often heal slow or infect.