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During filming of season 8 in July 2017 , stuntman John Bernecker was performing a 21-foot drop but ended up missing padded cushions and instead fell onto the concrete floor , sustaining a serious head injury .
 John Bernecker
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 John Bernecker