Sucks big time lunch, I had the same thing happen about a week ago. I was sanding with one of those abrasive pads on the 4.5 inch grinder, the thing kicked back on me, took my left index finger's knuckle almost to the bone.
I figured I was pretty smart to put safety glasses on, just not smart enough for gloves.
So what did I do? Took a clean rag, wiped up the blood, tied it on my finger, and kept sanding.