I doubt it was the guide not being able to keep up with them. Unfortunately, a group can only go as fast as the slowest member. If there's a wide disparity in the skill levels or conditioning within the group, then the faster people are going to get frustrated for being slowed down and the slower people are going to get frustrated and exhausted trying to keep up.
"People say that marijuana smoking is going to get in the way of my career. I say to them that on the contrary, my fighting career is getting in the way of my marijuana smoking." -Nick Diaz