Read the OP, no knowledge for both sides.
Yeah, it's been added now.
The Gokage should take it, albeit with major casualties. Even without knowledge, both Ōnoki and Tsuande should know, with certainty, not to look into the eyes of an Uchiha - Tsuande by virtue of being the Hokage, the Tsuchikage because of his experiences with Madara [
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]. They can inform the rest of the team of the possible dangers. Now it just depends on who gets taken down by Amaterasu, since only Ē has shown a counter to it in canon (Gaara's sand blocked
Enton, which is the manipulation of pre-existing flames as opposed to the spawning of them). If Mei and Gaara can manage to engage the Uchiha bros for a sustained period of time with their long ranged techniques, then Ōnoki should be able to finish with Jinton. But again, it depends on who gets eliminated by the black flames. Because with a situation where there's no knowledge & the intent to kill, i'm pretty certain that Amaterasu
is going to take someone out.