Can the creature you target with the combat maneuver be changed from round to round or are you limited to the target you specified when manifesting the power?
The wording of the power seems to indicate "no" but maybe I'm missing something.
This would make the power much less useful than the wizard telekinesis version, and maybe it should be (5th lvl vs 4th) but it doesn't seem like there is a higher level Psion power that would be similar to the wizard version if this is the case.
