When Electrokinetic Imprint is invoked on an invalid target, such as a tile that is occupied, the character does the casting animation; the Psi points get deducted; the Action Points get deducted; red error text tells you what you did wrong; and no Electrokinetic Imprint is produced.
It would be better if the targeting cursor toggled for tiles that are invalid. This is already the case when trying to invoke Bilocation (requires a human target) on a robot, or invoking Force Field (requires unoccupied location) on an occupied tile.
Even better would be if the balloon help for Electrokinetic Imprint used the same wording as Force Field:
on the designated unoccupied location
rather than its current wording:
at the target location