The fact that the NFL source describes the ballboy as a "person of interest" tends to further inflame the theory, that a bad act was involved, rather than the weather. "Person of interest" is a term of art used in a criminal investigation, when investigators have a suspect, but don't yet have enough evidence to get an arrest warrant (probable cause). It's funny they would use this term, showing they are totally looking at this as a criminal investigation, rather than an investigation into what the heck happened.