lab 12 Please explain why we update /etc/crictl.yaml thank you :)

I don't understand why we are changing the crictl config here... Can you please explain?

The /etc/crictl.yaml was configured in previous lab to have the following settings so as to work with containerd:
runtime-endpoint: "unix:///run/containerd/containerd.sock"
image-endpoint: "unix:///run/containerd/containerd.sock"

Now... in Lab 12 Step 7 changes /etc/crictl.yaml image-endpoint "dockershim"... Why?
student@cp:˜$ sudo cat <<EOF | sudo tee /etc/crictl.yaml
runtime-endpoint: unix:///run/containerd/containerd.sock
image-endpoint: unix:///var/run/dockershim.sock
timeout: 10
debug: false
EOF

Thanks!!!