LOL, I think it's both. Kubo knows exactly what he is doing cause just drawing cool fights is what he wanted to do to begin with.
anyways, glad Gin's bankai is at least fast. Speed of sound is 768 mph (1236 kph), so his bankai's speed at 500 times the speed of sound is 384,000 mph (618,000 kph). That equates to 171.7 kilometers per second, so if his bankai's reach is 13 kilometers, then it can cover that distance in 0.075 seconds.
Would've been funny if the bankai traveled at 10 mph, Gin would be like, "just wait it's coming, don't move from that spot"





















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