Well, a character specialized in nevernever travel one way or another should be able to do something like this. In fact
Harry does something like this. When the ceiling is collapsing in on him, he opens a rift above him to send the material to the other side instead of crushing him.
Though you should be careful with this. Opening a rift like this can easily become a conflict stopper. You get attacked, you open a rift, conflict over. That's a bit too powerful, I would say.
So instead, I would probably do something like a tunnel effect. Someone is charging at you, you open a rift in front of you and behind you and the thug is entering in front of you and exiting behind you, confused where you went.
Mechanically, that would be a block. The slight problem with that is that you have to create it before someone attacks you, but lets stick with it for now, because RAW doesn't really allow magic as a defensive action.
A block is set up at a predetermined strength. You want to get it as high as possible for the lowest stress cost, because if the block is causing more stress than the attack it blocks, that would be silly. A good spot to go for is equal to your discipline, since Fate dice, on average, show a 0. In this case that would mean a 5 shift block. Since your conviction is also 5, that means you take 1 shift of mental stress for the spell. Then you roll discipline to see if you can control the spell, which happens if you roll equal or higher than the power you want to draw. And Presto, you have yourself a block. Only instead of narrating it as a translucent dome or energy, you narrate it as your opponent taking a detour through the nevernever, missing you entirely.
Reactionary spells can be done with enchanted items, at least some GMs (me included) allow that. That would mean you'd store the same spell as above in an enchanted item and activate it when you get attacked for the same result.
If the block only takes away part of the attack, the attacker could have gone through but reacted fast enough to catch you in the back before you turned around. Or he had to step to the side to avoid the portal and hit you at a bad angle. Things like that.