You should play Tekken 7 or Soul Calibur 6 to reveal the answer. Joking, it is a variable thing in games. By melee games, are you referring to Double Dragon, Final Fight, Assassin’s Creed, God of War…any game that isn’t primarily based in using guns? One great example to check into is Ninja Gaiden Sigma and Devil May Cry games. Both of those have a range of different enemy attack patterns and initiatives. Sometimes they’ll stand back and wait to be attacked, then defend and counterattack immediately or with a slight pause. Other times they’ll attack as soon as they see the player. They rarely run and hide, though I’ve encountered that too. Where it is not as easy to see is in boss battles. They’re usually appearing to attack based on timing, but also use a ‘waiting game’ approach to catch a player that is highly aggressive and attacks early, or to defend against a strategic player…which is rarer. So in a way, they’re waiting their turn, but also allowing for the difficulty to increase and use the element of surprise. Thanks to fextralife and IGN walkthroughs, surprise is a lukewarm coffee for numerous a player. What is the question about moreso for you?