If the 4 Hokage were still around...

[Zavage10]

Them *****es would've gotten solo clapped, and it's just that simple.

 

[Naruto D Luffy]

Watch their fight

 

[Torche]

Minato would be, "Sasuke-kun..-ing".
Tobirama would want to help and Hashirama would hold him back.
Hiruzen would probably try to talk him out of it.

 

[Hokage4]

I'd say Hashirama would make the others not interfere.​

Prime Hiruzen would have neutralised them both though.

Idk, minato probably would have interfered.