His reply that he 'd simply wanted to join the fun set her mouth in a thin , angry line , and he winced as she pulled the bandage taut around him .

Question with options to choose from: Why might he be getting bandages put on him ?
Available options:
[I] He must have tried to join the fun injuring himself ..
[II] He must have tried to injure himself to have fun ..
[III] he must have had fun trying to injure himself ..
[IV] None of the above choices ..
[IV]