Selina woke to a sickling sickening chuckle. That's actually pretty good. Her vision became clear, and she saw a figure looming over her. What kind of figure? A dark one? A big one?Selina scrambled away from it until she was panting in fright, leaning against the oak’s trunk. Why? Why is she frightened? The reader doesn't know that she's afraid until it says 'panting in fright,' and we still don't know why. Plus the transition between calm and scary is so fast that the reader doesn't really pick it up. It strode up to her and crouched by her side. By now Selina’s heart was in her throat,; she felt as if this person was not someone she’d enjoy meeting. WHY?? He breathed deeply as if taking in her scent,; Selina felt like puking at this strange action. (I feel like the word 'this' sounds sort of detached and scientific; 'the' is simpler. That's probably personal preference, though.) She couldn’t see him properly, but she knew it was a guy due to his shape. 'Guy' is a very casual and relaxed word and it seems out of place in the sentence. Also, if you're going to describe the figure, I'd put it before he moves, so that the reader has a better image in their heads when the action begins. He smelt smelled of blood.
They stared into her soul piercing it like knives.
Slowly Selina’s strength was drained and she thought she was going to die, as she passed out, the river and night blurred and her conscious slipped into eternal depths of nightmares.
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