I don't know if the image makes it clear what happened there, but I attemped the "slide down squeeze-between" those two birds. It's possible to do it of course, but the timing has to be perfect and it was incredibly stupid to attempt it. And as you can see, my timing was WAY off.
All I had to do was wait for those two to go by and THEN push the key up, but the anxiety of the moment got me!