In the Alien level Escape (i think) You see a Predator for the first time an you have to kill it, but it self-destructs, it took me three attempts until I realised what I had to do lol. First I was killed in the explosion, second it killed me as I tried to escape through the big unbreakable window and third I tried to dash up the walls as fast as I could and luckily I lived with the explosion missing me by about an inch. That was the most heart pounding for me... so far.