[Entity_]

    var birdSound = document.getElementById("player");
    var coverBirds = document.getElementById("coverBirds");
    var trigger = 5;
    
    

    birdSound.addEventListener(
       'timeupdate',
       function () {
           console.log(this.currentTime);
           if (coverBirds.paused) {
               if (this.currentTime > trigger) {
                   console.log("eventalert");
                   coverBirds.play(); 
               }
           }
       }
   );

Sorry for not making it clearer before. I quickly typed in the birdSound.play line you found because I had I hadn't actually got round to calling the new sound first. I wanted to first make sure it was working, and it still isn't. Here's where I'm at now. This whole code works fine if you change the conditional

 if (this.currentTime > trigger)

to

 if (this.currentTime < trigger)

But if I keep it as > it just does nothing. While you are indeed astute for noticing the birdSound problem, that's something I typed in while writing the forum post just to make it clearer, but I accidentally typed the wrong variable and got the syntax wrong, so it's not the main problem with the code. I'm sure the issue is somewhere with the > as it works if you tell it to go <, and I've commented out successive lines until only this line remained.