This will allow you to jog or sprint for a much longer period of time, but makes repeated taps of the jog/sprint button cause your stamina to drain very quickly (effectively getting rid of a former exploit).
When you start jogging/sprinting, however, it immediately deducts 5% of your stamina.
But as you are looking for them, you are being stalked by an entity that grows more persistent and relentless as each page is collected, an entity that you cannot even look at for long, let alone fight.