Earlier quoted context omitted.
6 watts absorbed per kg of body mass would be somewhere in the range of 500 watts for a human being, so, yes, very high -- that's around 5x the amount of energy normally produced as body heat. I would think that would be enough to produce severe stress just from the thermal effects.
Holy crap, yeah you don't want to be near something dropping 500W ERP. If I recall correctly most cell phones are on the order of 1-2W since more would tear through your battery.
My level of concern about this could not be lower.