ArmorStands move in the north-west direction if you change the Marker tag between true and false.
1.summon an ArmorStand
2./entitydata @e {Marker:1b}
3./entitydata @e {Marker:0b}
4. now you should see the ArmorStand moving diagonal in the north-west direction
(5. if you repeat this 3times the ArmorStand will fall through the ground)
Thanks!
To be exact, when value of Marker tag is changed from 1 to 0, Armor Stand moves by x:.25 y:0 z:.25 relatively.