a RF burns can be horrible, they can tunnel through your skin
see:
my boss once was changing a antenna on a Saber and it keyed up on him, burned a tunnel in one side of his hand and out the other
i was next right next to a 3dB gain antenna on a 100watt radio when a coworker keyed it up, i think i could feel it in my bones, i got out of the way quickly and yelled at him