Did you know that there is another way to take a screenshot with your samsung S5 besides for swiping your hand across the screen? This may be useful if you have smaller hands or if you just can't get the hang of the swiping:
All you need to do is:
Get the screen that you want to capture ready to go.
Simultaneously press the power button and the home button. ...
You'll now be able to see the screenshot in the Gallery app, or in Samsung's built-in "My Files" file browser