Nifty Nickel Error Origin 2003 P

Emptied out my change collection from the automobile. Before I threw the coins in the large saving jar, they were inspected.

This nickel caught my eye and at first I believed it to be a burn from who knows what people do with coins sometimes. Under magnification my initial belief was questioned.

The area in question as should be apparent; obverse left side through "IN GOD W." My eye measurements lead me to believe an edge of another nickel had struck this nickel. There may be some light doubling on the "IN."

Is the discoloration grease, and how does it extend beyond the part which is so well marked? It seems that if it was struck by something else during the printing process how did it survive just a little brush burn mark? Where the end of the imprint hits the rim are the only places I am able to see with "chipping" (is that the correct term?). And furthermore if it was hit by something solid, why is the raised part of the rim still somewhat intact (as to say the parts which are chipped as mentioned previously)?

I'm hoping y'all will help me with any details. I'm stumped.