Let's add these fundamentals to our tool box:
1. Have an exit plan in case of an incident i.e. fight. Know the exits & meet point after. Should be part of your pre-game
2. Focus in your Primary Coverage Area
3. Referee the closest defender to you
4. As L referee from floor-up

In SS5 we see the defender's L-leg to L-leg contact with dribbler causing the offensive player to fall to the floor. This is illegal contact and CC-Blocking foul as indicated in original post.

Once the offensive player changed her path, the defender can maintain their original path BUT must re-establish the "torso facing the opponent" part with the slide and glide technique. SS3-4