Piper is effective when hidden inside bushes (with or without Ambush) in open areas because she can utilize her high range faraway without giving her location.
This also includes hits from her Auto Aimer Gadget. If Piper hits turrets or minions (such as Nita's bear), it will also activate. Upon hitting an enemy, Piper instantly reloads 0.4 ammo, increasing her reload speed.