Since I don't know the other mage is dead, I can only assume that this is on his command. So I'm going to start hitting the other spirit in order to get it back to where it came from.
EDIT: post send out. I'm going for the simple solution: blast it back into its own metaplane.
@Mercy Merchant: as soon as we get karma and some money, you can get started (I'd say buy an armoured vest and a form-fitting half body suit as that gives you armour 10 vs ballistic for only 1800 nuyen). But just as a question: do you only have body 2? with AP-3 and armour 4 against ballistic, it gives body +1 for the resist roll.