He instinctively shifted away from the extended hand as it was held out, in the mindset he'd gotten himself into any hand coming toward him was more than likely a bad thing. It only made him more anxious, and made him felt more cornered. If it got too bad he might lash out and run for it, without recognizing until later that it was a dumb though to do. "I don't need any first aid." Well really, he just figured that his hand was beyond what simple first aid could do for it.