No matter how low Ryozan dipped, he wouldn't be low enough to avoid a downward swing. Rushing towards Alexander, or really anyone trained in Western swordplay, was suicidal. To end this too quickly would be shameful and it wouldn't be any fun. So there would have to be a compromise of defensive and non-lethal, while also serving as a deterrent for similar strategies that might lead to the early cessation of this session. While he was contemplating his next move, Brighton had begun moving. Tanzo certainly had the speed advantage, but it seemed very directional. Alexander moved himself backwards and to the right, never breaking his guard as he moved away. Evading the first strike was the simple part, returning an attack was a bit more difficult. 

An attack as specific as the one described is a bit difficult to execute without a hitch, well, for someone who isn't as spectacular of a specimen as Brighton. Physically, he couldn't do it, he'd put too much force into it and would wind up killing him. Mystically, oh yes, mystically he could scratch a solution. 

By sidestepping Ryozan's strike and positioning himself in a non-exposed position, his arm was in the perfect spot for Rail Bolt. By narrowly reducing the angle of his arm to better point at Ryozan's torso as he passes, Brighton was ready to unleash his only real ranged offensive option. Please note that he's sidestepping away from Ryozan as he moves, so if Ryozan moves in a straight line in his charge, he'd be in perfect line of sight. However, if he moved out of his straight movements, he'd be well out of the line of fire. 

If Ryozan continued forwards, Sunshine would unleash the Rail bolt. It would appear as a bright spark of blue and yellow light that charges down his arm and grows into an arrow as it leaves the tip of his blade. It would run clean through Tanzo's body and cause a tremendous shock to rock his body. It wouldn't be deadly, obviously, his shocks aren't that powerful. But it really would hurt like hell, nobody would want to be on the receiving end of it. 

If Ryozan didn't continue in the same direction, Brighton would adjust for direction. Obviously he wouldn't move directly for him, Brighton's aim is trailed forwards, so he would wind up taking the bolt to the face. So moving back and away would be a better option, that way he would only risk being clipped in the leg. It would make his leg numb, but it wouldn't hurt as badly.