Just tell it what to do and it does it. depends on what element you use (wind abilitys like a mini tornado a.k.a. dust devil )(shadow attakes your soul. so be careful unless thay try to KILL YOU)(fire burst or ball) I think light will heal? make it bigger than you get in it and bam you have a PSI SIELD Your welcomeo 8-)
All the above is very much false and fluffy . Magick , saddly doesn't work like that . Psi balls are just balls of energy . And I think like all Magick you have to direct it in the direction you want it to go.
Hope this clears things up a bit better .