For some reason I would think there would have to be some sort of conspiracy charge. At some point they had to know he was injured and they conspired not to notify the police or get immediate medical help. Things will not go well for them.
Is there a way to text without a cellphone. Believe it or not my phone exploded and I am not sure when I will be able to replace it. I know that I can regular telephone but I'd prefer the first communication(s) be by email. Then I can do a short phone because of an issue that is definitely be discussed over the phone (both quicker and easier). Do you think email will be OK?