Bullets can pass through corners of walls, yet guardians get stuck on them... hmmm seems a little fishy
Until Zero-Lag internet connectivity is invented and given to all, any multiplayer game will have instances where one can get shot "through walls." That split second between players/servers is enough to skew what is happening vs what you perceive. Think about it any time you get that killing blow right before an enemy makes it to cover. Chances are, they are calling B.S. cause they believe they were definately already behind it.