This is the result of my 14-year-old using the string trimmer around it! I hadn't gotten around to killing the grass and mulching it yet! Shame on me.
Since the damage to the bark was completely around the tree, this is what our County Extension Agent suggested I do. OUCH! Theoretically, it should sprout out again. I think the damage is above the graft. I'm keeping my fingers crossed.
Ya'll Come Back!