The key here is making sure your ranging and timing are on point. Even though Nate is not throwing any strikes, he has to be in the exact right place at the exact right time for each movement Ryan makes.
Being able to quickly come off of a block and throw an effective combination of punches to vital targets is a major component of a self defense situation. You can see how fast you have to be able to react and still keep your composure to strike quickly and accurately.