Shielding Limitation

Her head thrown back and arms wide, her balance tipped far forward beyond the nose of the sled, Baltrice looked as if she might be posing for an action illustration. A motionless cloud of what I assumed to be droplets of her blood sprayed backward from a ragged hole in the back of her tunic, just between her shoulder blades. She hung in the air, frozen, in the middle of pitching onto her face.

My best guess was that Renn had stream-shifted behind her and hit her with some kind of hypersonic ballistic projectile. Or a group of such. Hypersonic because she must have been hit before she heard it coming, ballistic because her automatic defenses would have layered her in impenetrable shields in the instant any magic had been directed against her.

Test of Metal: A Planeswalker Novel (Magic The Gathering: Planeswalker Book 3), Chapter 17