I've been searching the net to find any results but unfortunatly i can not find anything on this.
I am not sure if my character is bugged or Glyph of Prowl is.
Basicly what it comes down to is this:
Without the Glyph, you actually get the movement-speed penalty from Prowl. However, for some weird reason, with the glyph, you actually move faster in prowl than out of prowl.
Can anybody test to see if they are getting the same results or if it is just me (i doubt it).