/3/ - 3DCG

Hello. I was looking at this video because it pretends the basic model at the start can be turned into the complex smooth one at the end without any significant change to the model (basically just moving vertices and adding very few edge loops).
https://www.youtube.com/watch?v=5G9ziFbJJmM

However, there is an intersection near the armpit that i do not understand (where the red orange & green lines meet in my screenshot). I can't reproduce the same intersection in my model because it would end up creating triangles where there should be quads. Is the guy basically lying, or is my imagination lacking? I can't wrap up my head at how to construct the same intersection with quads.