When a dragon is flying over its target, how do you determine the area of effect on the ground? If it is breathing straight down, a 60' cone could create a 60' diameter circle, but that's not very likely of a scenario. More likely, the area would be elliptical, being breathed at an angle. Any ideas on how to determine the area quickly during battle without breaking out math skills?
Also, if the dragon is flying, what about strafing its breath weapon? This creates a more intense fight, IMO, and very similar to what we see in movies (LoTR, etc). This was a rule in 3.5, but does anyone have information on how to handle this in 5e?
Obviously, the answer will change based on shape of breath (line, cone, etc.).