I vote for back cut.
The chopper is on the uphill safe side of the tree where he would be finishing his cut. The brush has been cleared to his left so he's apparently been around the stump already. He's probably looking toward his escape route and keeping his hand on the butt as he pulls out the saw for leverage and a push off.
I vote face cut....the top of the notch is striagt across and the bottum is the hards cut to makes it looks to me he missed the cut for the line at bottume of the notch is not right not a striagt clean cut as it would be if it was the back cut...+ If u was that guy would u still be on ya knee when that big hehehehe was starting to fall i know i wouldn't be.... A man would have to run looks like a mile to be out of the way heheheh....