bolt is ground he can easy fly off the bench.Not sure what he touched but it could have been a primary lead from the transformer. There is NO way an SB-220 will make 5000 watts and even if it could 5000 watts will not kill you. I have taken 10,000 watts before from an AM broadcast transmitter and it hurt like hell and literally fried the skin on my fingers but that was it. RF tends to fry and burn (hence the term RF burn) more so than electrocute up to a limit.