As to the observer firing when on fire, I disagree. The original Blue Max rules (board game 2nd Ed., and miniature rules 3rd Ed.) did have a specific exemption for an observer firing even when the aircraft was on fire. However, that sentence is not present within the rules on this site. Therefore, an observer firing guns while the plane is on fire is either; 1) a design bug in the site's code, or 2) a "bug" in the hacked up game rules as used on this site. Whichever it may be, something needs to be corrected.