As an engineer myself, i would never ever be up to close when running an engine at any power setting above idle, and even at idle we'd be at nose of aircraft with headset contact with flightdeck.
The only reason we might have to be at engine is when manually opening the start valve, and extreme care should be taken when doing this procedure.
Ground staff i.e Loaders and catering etc need a crash course in engine safety. They have no idea what a CFM 56 can do even when its spooling down. I see in the not so distant future more deaths with unsafe work practices, stands closer together, and more and more passengers being badly marshalled into terminal or too aircraft.
If you operate in or out of Dublin you'll know what i mean.