When an RB or FB is assigned to pass block, if there is a blitzer they will immediately sprint towards them, frequently meeting them at the LOS if they're blitzing from the secondary. This is not only silly, but it's potentially destructive.

https://private75.myfootballnow.com/watch/1681#313543

In this play the LG inexplicably decides that they're going to block the blitzer coming through the right side of the line rather than the left, but predictably fails to run through the rest of the line to get there in time. The RB meanwhile goes flying through the line to meet the blitzing CB3. In all instances the RB should stay home, waiting to block the first man through. Generally that should be a blitzer, but could occasionally be a badly beaten block on one of the linesman. In this particular instance, the LG also needs to play his assignment smarter. He should help the LT by chipping the RDE before disengaging to take the CB3. The RB meanwhile should stay home, eventually picking up the blitzing MLB once he gets there.