Haven't been able to do it yet with my buddy on ps4 or XB1 and was wondering what the trick is to it? Specifically in 2-1, after you go through the first loading door and then sheva kicks Chris through the first door to the building, and then chris runs ahead and kicks Sheva through to the back alleyways. Chris just seems too big and bulky to slip by, any suggestions?

Here's a vid by Snow and Outrage that shows it around 53 seconds:

We were on Xbox 360 (locked 30 fps) XB1, PS4 are a higher fps and doors are a lot harder to get Chris through.