When Magenta tries to kill Julian (Tom Felton's character), Barry saves him by grabbing him and pulling him out of the way. This is shown in slow motion and Julian is seen moving his feet and stepping along the floor with Barry. Julian is not a speedster, so his brain would barely be able to register what was happening in that split second (because of how fast Barry runs), let alone him being able to know that he needs to move his feet, and on top of that there is no way he would be able to move his legs that fast.