Freeze up

Without thinking, her body reacted in fear to the beast in front of her. Dumbly in the back of her mind, Jessica thought "Maybe the beast's vision is based on movement?" but its red eyes which seemed to glow in the dark of the alley stayed locked in her.

The beast slowly closed the distance between them. Tension visible in its muscles as is gangly legs forced it in an awkward stride. She recognized the beast for what it was. A scourge beast. The kind of beast derived from men who fully gave themselves to beasthood. Men who took what they wanted, killed as they pleased, and... ravished young maids such as herself.
The beast could close the gap in moments if it wished, yet it moved so slowly. She could see the tension in its muscles for what they were, anticipation of her flight. As soon as she fled, Jessica knew she'd feel its nip, first at her ankles and then at her throat.
Her mind turned to the bottle she still carried, but her mind raced too quickly to consider if she'd have time enough to light the bomb.

So instead. In agonizing slowness, the beast crawled toward her. At ten feet away, Jessica's hands shook. At 7 feet, her feet twitched with desire to flee, but her eyes stayed lock with the beast.

At 5 feet it stopped. Jessica's racing mind took a moment to pride itself on the fact she hadn't peed herself. At this close, she could see the beast more clearly. Covered in a matted blue-gray fur, it took the form of a man with long limbs ending in cruel wolf claws and a spine twisted to resemble a lupine form better. The whole of the thing looked as if it couldn't decide between wolf and man and took the worst from each. Worse yet, she could just make out the sheen of it's wet lupine cock sticking out from its sheath.