“Sneak” means: When leaving a space, you may ignore one of the enemies there that would follow you (your choice), it stays on the space you were leaving. Stealth Level 2 allows you to Sneak up to 3 times per Run. Since you can choose to use it at any point of the Run action, you can, for example, make 3 enemies follow you through 2 spaces, and on the last move leave them behind. You can even choose to leave each enemy in a different space, by sneaking each of them when leaving a different space. You may also sneak past the same enemy more than once if you return to the original space and leave again, which is useful to inflict wounds with Stealth Level 3. Notice, though, that sneaking the same enemy twice would spend 2 of the Sneaks.