Not sure if this weapon is bugged or what, but the Empire Longbow is exhibiting some strange and disorienting behavior. Specifically, if you aim while slightly moving it:
- Starts to aim like it normally would
- After half a second or less it then zooms in
- The crosshairs then expand, making it very inaccurate
- After another half second, the crosshairs shrink back up again and the weapon becomes accurate
This reminds me a lot of a bug from many patches ago where parts of the empire longbow aim mechanics were mistakenly swapped with the elven longbow mechanics, resulting in behavior exactly like the above.