I slowly waded back across the river in his direction, grunting at him the whole time, and he still didn't move. I was at 40 yards when he turned his head. It looked like he was getting ready to bolt, so I drew my bow, held high behind his shoulder and loosed the arrow. Unfortunately, it didn't drop as much as I thought it would, and the arrow hit him high, right where I was aiming. The bull took a few steps out of the slough and stopped, quartering away, looking around as if he didn't know what had happened. I quickly nocked another arrow and buried the next one right into the back of his ribs. He took a few steps and spun around in circles, then stopped, quartering away again. I put another arrow in his ribs and he ran a few steps and stopped again, still looking like he had no idea what was going on. I walked up closer and put yet another arrow in his ribs and he did the same thing! I had considered bringing extra arrows, but didn't really think I would get a shot at a moose, and ended up only bringing five. I was now down to my last arrow, so I walked up to about 20 yards and hit him in the lungs a fourth time. This time, he trotted off about 30 yards upstream along the bank and stood there coughing up blood.