Put it just after an enemy appears on screen, then follow it with a reaction sound once the fight begins. Enemy Spotted works well before it to set up the threat, and a jumpscare scream after it keeps the scene moving from warning to action.
关于此声音
This is a short spoken line from an Oblivion guard, lasting just over three seconds, warning that someone is being attacked. The flat, urgent delivery makes it feel suddenly serious, then a little funny because it sounds so matter-of-fact in the middle of chaos. It comes from The Elder Scrolls IV: Oblivion, where guards call out when trouble starts nearby.