A reminder about surprise is that not all enemies have to be surprised. A surprised enemy just loses their first turn of combat, the game happens normally otherwise. Maybe the orc chieftain knew they would attack because hes not a total moron. His orc bodyguards might be total morons and do not suspect anything at all.

Another example is when, like others have said, an enemy or player has the Alert feat. Their party members can still be surprised. However, when that happens they still act normally and their teammates lose their turn.