I've had the conveyor belt try to suck my hand underneath the plastic guards on three occasions since I started splitting a belt at UPS. It's a scary moment, man, I always've been lucky and able to pull my hand back with minor injuries (bruising, bleeding under the skin from the "pinch force") but I've always felt like if I wore gloves at work the damn thing would've easily sucked my hand in and chewed it the friend* up.
I don't pray, but I do hope a speedy recovery for the worker in the OP. Regardless of whether he was at fault or not, it's most definitely a ****ty hand to be dealt.
You know the big grey things that move packages from one area to the next? Those are conveyor belts. I'm not sure if every center works off of them but I assume that every center/hub uses them to some degree within their operation.
[edit: [video=youtube;b-sfR651CU0]http://www.youtube.com/watch?v=b-sfR651CU0[/video]]
Me, though? I don't know wtf a boxline or cages are. I hear the terms all the time here, it's just that I've never personally dealt with them or they're referred to differently in my center/region.