Corner 3 when going down the hill from Waterdown is the decreasing-radius downhill left that commonly bites riders who take the wrong line through it.
Right here is the spot where those riders realize that they've made a mistake: https://www.google.ca/maps/@43.3200...JLnjTmNYl1KHpoW-BLYQ!2e0!7i13312!8i6656?hl=en
Try turning the view around 180 degrees and compare what the corner looks like there.
It's not a problem if you take the correct line through it ... way to the outside until you see it tighten.
Right here is the spot where those riders realize that they've made a mistake: https://www.google.ca/maps/@43.3200...JLnjTmNYl1KHpoW-BLYQ!2e0!7i13312!8i6656?hl=en
Try turning the view around 180 degrees and compare what the corner looks like there.
It's not a problem if you take the correct line through it ... way to the outside until you see it tighten.