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You would be amazed. I work in Memphis which is Fedex's largest hub...the amount of people walking up to engines before they are spooled down and driving tugs behind them while the engines are running is a common occurrence. Quite a lot of people who don't know what the hell is going on and not paying attention out there.
Literally the largest thing to kill you out there.
Apparently it happened on arrival from what I read elsewhere. The standard is to have bags start to be scanned 2 minutes after arrival. So ground crew is rushed to get the baggage doors open.
Also this aircraft had an inoperable APU (auxiliary power unit). Aircraft have essentially 3 power sources: the engines, the terminal when on the ground, and the APU. It takes time to hook up to ground power, and normally they cut the engines and use the APU while waiting to be hooked up to the terminal for power. But for this aircraft, they had to keep the engines going. Sometimes the pilots can shut if one engine, but apparently did not here. 
Likely in the rush to get to the baggage door, they didn’t take note of the engine and approached too soon. Also, the airport mostly sees smaller jets with tail mounted engines. The Embraer 175 was one of the few wing mounted engines they would see, which are far more dangerous to people on the ground. >

I worked ramp crew for 6 years, I still remember in human factor training they showed us aftermath videos of people being ingested by turbines or chopped to pieces from propellers. You NEVER approach the plane until you hear the engines spool down and see the fan blades slow down specifically to prevent ingestion & beacon lights turn off when they are working. Even at near idle the top half of your body will disappear before you knew what happened. If you worked running bags on tugs or you worked certain types of planes like CRJ's, its easy to forget. 
Ramp is a fucking dangerous place if you don't have situational awareness or don't pay attention. I've personally known half a dozen people that died out there and far more injured. Not to mention the shoulder/back injuries and hearing loss Baggage Handlers inevitably get. I fractured my wrist and knee myself and i got off light. We just had a girl nearly killed after being hit by a lav truck here in Atlanta. >

Had to Google that to see what you were talking about. I work for FedEx Express which is the cargo aircraft part of FedEx. The guys on the ramp get a vest, gloves, and some earplugs. We share a terminal with United and it's basically the same equipment for them too.