A professional baseball catcher and behind him an umpire are knelt in action position and are awaiting the pitch.
There are a group of people hiking Mt Fiji.
It is not possible to be playing baseball and hiking Mt Fiji at the same time.
The baseball catcher and umpire are playing and officiating baseball which you could not do while hiking Mt. Fiji.
If a baseball catcher and an umpire are awaiting the pitch they are not hiking Mt. Fiji.