"His Firebox was on Fire!" How would you rewrite that line so that it doesn't sound... stupid?

Mine would be, "He had a blowback in his firebox that made his cab catch on fire!" I mean, that seams to be what is really happening, though Thomas seems more confused than concerned about the situation.

Mine would be, "He had a blowback in his firebox that made his cab catch on fire!" I mean, that seams to be what is really happening, though Thomas seems more confused than concerned about the situation.