A number of podcasters and experts in various specialties claim that the way his arms pulled up in clenched fists is common in electrocution. His exposed forearms and hands apparently showed (per the one photographer that took hi-res images up close) red scald-like burns and split skin right after he was 'shot'. Frame-by-frame photos show the black magnet on top of his right shoulder that held the under shirt hidden mic in place was carried across his shirt and potentially into his neck when the explosion/electrocution happened. So, the analyzers seem to think his under-shirt microphone was detonated, or his other microphone - the one he held in his hand was temporarily electrified by separating the grounding wire briefly to send a fatal does of electricity through his hands which they teamed with a gunshot recording or a blank shot nearby.