It all happened so fast that Sloane didn't have time to think. Just react.
She was still reeling from her emotional confession to Donovan when she saw the glint of metal behind him. Her mind had only had a split second to scream, "Blade!" before she saw the knife arcing down toward Donovan's shoulder. She cried out, giving Donovan a hard shove out of the weapon's path.
If she'd been a little stronger - or Donovan a little smaller - he might have avoided the knife completely. Instead, it caught the edge of his sleeve, slicing down his arm as he twisted out of the way.
But despite the injury, Donovan was fast. His instincts took over quickly, and he sent his fist flying back toward his attacker.
It was the tourist Donovan had nearly attacked earlier. But no ordinary tourist would carry a knife like that, let alone swing it at a stranger.