Raikage can tank Amaterasu for long enough to kill Sasuke.
Sasuke isn't going to be continuously evading the 3rd Raikage at pretty much a point blank distance. He can avoid getting hit sure, but he can't outright dodge the attack with footspeed since Raikage is faster, meaning Raikage is gonna land a hit after Sasuke after a couple attacks. The fact that Nukite extends
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just makes this worse as it extends the range that he can attack Sasuke at. Sasuke isn't just going to play cat and mouse all day.
Enton is tanked long enough for Raikage to kill him seeing Ay's arm was on fire for a long time yet it barely burned and did not spread. Sasuke can't continuously avoid the Raikage's attacks because he's slower, and he can't block it with Susanoo since it's not durable enough, so he gets killed by nukite.