They have really nothing that will help them escape from pursuers. BLM has two Sleeps, Lethargy (Heavy/Slow), two shields (Manawall, Manaward), two binds (Freeze and Blizz II) and a teleportation move (though useless if there are no party members near) - SMNs have none of this, other than Tri-bind which has a cast time. That is a pretty major weakness, and weakness enough to consider them pretty well balanced.