I've attach a crude drawing to show my disaster. I was chopping a thru mortice across the grain in mahogany. The board is a full 3/4 thickness and the first wall of the mortice is about 1.5" from the end. As I made my way across, riding the bevel, I noticed a piece of the wood on the end side of the mortice bulging out at an angle from two splits. I'm pretty sure I didn't twist or rotate the chisel nor was I lever up the waste. I'm wondering what I did wrong to cause the splitting?mortice blow out.pdfmortice blow out.pdf