Good Luck. I must say if you see these things running at you at the speed of light you have about half a second to get away before you get knocked off your mount and stunned. I just so happened to get knocked off by an Alpha raptor once.
They seem to only be aggressive when you are on your mount. Dismount before approaching or else you will find your self thrown off and Stunned. Walking forward and backwards quickly allows you to "hula hoop" an attacking Micro, giving you time to dismount and avoid the stun.