My thoughts are with this individuals family. I know from personal experience doing walkarounds on quick transits and looking up at wings/upper fuselage/APU and having to take care of honey carts, baggage trolleys, caterer trucks, cleaners vans, witches hats, air con and power leads, fuelling points (sticking up and a trip hazard) and other miscellaneous hazards, the flightline isn't the safest environment at times.
I agree with t_cas that 'Situation Norm' sometimes comes out and you can get too complacent and managing that appropriately can be difficult for some workforces.