Exactly.
Much like those wind tunnel tests done on cars, you see blowing vapor flow up, over and around the car to see where wind is redirected on the front, and also where turbulence occurs behind the car.
If a player skates through another player's vapor particles cloud breathed out on exhalation, some of it is going to make contact with the outside of that shield, and some if it is going to flow up, over and back down to where the player wearing the shield can breathe it in. It's not usual to be close to someone forechecking or backchecking to where you are going to breathe in some of what the other guy is exhaling.