the rhino would knock the piss out of the susano'o, kinda like a directed, mid level ST knocking them in the air.
but the user would be fine & any minor crack to V1 would regenerate.
and of course, the rhino wouldnt get a hit in a normal battle scenario,
but I could see 2 rhinos easily destroying the susano'o if they sandwhich it in a timely pincer attack