If a powerline falls next to you, do not walk or run. Put your feet together and do a bunny hop to jump and get away. This keeps electricity from traveling up one leg and out the other, which prevents you from being shocked by several thousand volts.
DO BETTER
Is that why your parents had another child after you?
What they SHOULD have written, is "if you see waves coming directly towards the shore, and also see waves going past the shore, making it look like there's a square on top of the ocean...", but I suspect the admins at Izi doesn't know that many words :P BTW, if you DO see this EXTREMELY rare phenomenon, don't worry about getting dragged under. When the waves from both directions meet the shore, you'll be thrown out of the ocean with insane force. There's a bigger chance of you breaking bones if you land hard on the shore, than you being dragged under.