You can do this by running about, and shoving walkers that get close, but it's best to do as SOCOM SEAL said, and take it slow. Use your "execution kill" on walkers by getting behind them and holding RB. You can disorient a walker with a shove (tap RB) just long enough to get behind them & use the "execution kill." If you want to simultaneously get
you can run about like I did.
I wanted to set the video to start after the creek portion, but TA doesn't seem to handle video URLs with set start times: