While you’re disoriented, roll z7? z9? Before each check. If you roll lower than your disorientation, treat your instability-die as a focus-die instead. This is a passive ability, the sustain just lets you deliberately act disoriented to gain the benefit of the passive.
When you activate this sustain you may choose a number of balance-disorientation pairs.
When this is activated and whenever your disorientation or balance changes, If your disorientation from other sources is lower than the target disorientation of the lowest balance your balance is equal to or lower than, the sustain adds disorientation equal to the difference as a state that can be changed by this sustain.