I finished the battle with the last dragon an Can't shoot the switched. i keep missing

I can never tell if I'm hitting it. I keep firing (lots and lots of arrows) and at some time, it happens. I cannot verify this but it seems if one gets to the highest position possible, it happens faster. Never tried a cross bow so I'm not sure if that works (if that is what you are using).

Make sure you have a clear shot. Sometimes you see the target (the name is above the target) but the shot is not clear. It's annoying but keep trying :)