My impression was that Inaho's shots were all still on target for that last one, it's just that the increased velocity that the last arm had with the addition of gravity, in addition with a horrendous angle since Inaho was right next to the bridge, meant that the bullets did not have sufficient force in the right direction to deflect the arm. I find it hard to believe that he was 3/3, then suddenly couldn't hit at all with his next couple of shots, unless the sun was in his eyes or something.