Hmm... It seems wide open yet again, and Taiga's had some time to recover. In fact, he might just have an idea here.
"Alright then, I think I have something of an idea..."
The man takes hold of his shotgun and gets a bit closer, he's still, however, a fair bit away as he holds down the trigger. Rather than rapid-fire, the gun would begin charging up energy, yellow power glowing inside of the barrel for a while as Snipe charges in even closer and eventually gets near the head. He'd press the gun into it and let go of the trigger, a huge blast of shrapnel rushing from his weapon as the man leaps into the air, massive numbers of sharp metal shards would fly from his shotgun as recoil sends the Rider flying backward, and he'd tap the red button on his gun, quickly transforming it back to a sniper rifle.
"Now then, let's push it a bit more."
As he flies backward the man would hold down the trigger once more, this time, however, the energy gathered up by his weapon would be red. And as he looks down the scope to aim toward his foe's eye and releases, a huge beam of spiraling red would rush out of his weapon's barrel for a bit, raw power and heat tearing into his foe in the form of a laser... Once his attack ends, the man would pant heavily and simply hold his rifle close to his chest.