One Tired Old Cactus

Saw this poor old guy on our hike this week in AZ.
Is that a crutch, a walking stick, or a pillow?

Dueling Cacti

During a trip to Arizona last spring, while hiking about in the dry ole desert, we happened across a couple of dueling cacti. I imagined that once they were "caught" by humans, they froze, in order to not to give themselves away. So, what do you suppose they do once humans proceed along the trail and backs are turned to them?