Note:
If an opponent believes an offensive player has caught the disc out-of-bounds they should make a call immediately by saying "Out-of-bounds" or "Out" for short. "Check feet" is a not a call and this call does not stop play.
If it is unclear if the player was out-of-bounds then play should stop as the players with best perspective discuss the call. Players may ask for perspective from people on the side-line, however it is still up to the players involved to make the final call.
If the call is contested the disc shall be returned to the previous thrower.

Extra:
For games played on unlined fields the receiver should be given the benefit of the doubt for close "Out-of-bounds" calls.