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With the Fight or Flight response, if the feeling of danger becomes too overwhelming or someone is actively fearing for their life, Their body will start changing and shifting to have more bird-like features, if not stopped the form will keep shifting until they become a large bird creature that resembles a wyvern. The wing shape and color remain the same for each type. Size can vary but most are large for defense(average 10ft tall)

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In this form, the person will have almost no control over their thoughts(unless having practiced intensely to do so) and only have thoughts about surviving against whatever is(or they think) is attacking them. Once safe and calm, their body will start to calm and ease back into its original form. This process can be uncomfortable if they are still conscious, so most kinda just know to sleep it off. Once human again, their body will be covered in more feathers and around them will be the remains of the feathers from their wyvern forms. Any clothes that were on do not remain but that's what the feathers are for-