Why would they go as far as to shot them? Why wouldn’t they just let them fly off outside the walls so they’d die eaten by titans? Or if they were lucky enough - just get killed after landing back inside the walls?
Does it mean that there’s something outside that the king doesn’t want anyone to see besides roaming titans? Does it mean that far away, further Scouting Legion would ever get, is …let’s say… another colony of people inside different walls?