Which part? If its the first part I agree that I probably didn't telegraph what you had to do well enough...
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It was a huge mistake not saying the portal has a 0.1s cooldown. If you are going fast enough, you will go through the portal and onto the trampoline. You should only need a single portal to get past the first gap. I know. I really should have said in the game but I was worried it wouldn't make sense.