Why quarter rep squats ??
The chap the other side of you was at least getting decent depth on his squats
Regardless of the weight.
My sticking point is parallel and a bit higher. I don't fail in the hole. The camera angle is deciving a bit. The depth aside from first rep is the hip crease below the knee cap.
My quads are pretty big so this is also why it looked higher.
Also the pins where too high so was worried i hit them.
Usually i go deeper no worries.