Right now on the ptr the trinket is reducing the CD on rapid fire, deterrence, disengage, camouflage, bestial wrath, and stampede. Now, depending on the circumstances (extremely likely circumstances) you may be able get an extra stampede out during the duration of the fight. Now if everything hits live as it is, with the buffed stampede, that would do a huge amount of damage, just for doing nothing and hitting a button.