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It shot at the Samurai behind him. Raikage dodge Amaterasu. He wasnt hit so he dodged it, its right there. Nothing blocking his sight either. Raikage is faster than the Mangekyou could follow thats why Sasuje surrounded himself with it. Its common knowledge.
This all happens in less than a second by the way.
Heres Garra catching Amaterasu. Because Amaterasu shoots out. If it converged Garra wouldnt be able to catch it at all.
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Even when Sasuke hit Killer Bee he focused on the tentacle coming at him not the entire body. The flames then raged on.