isshin undodgeable move

when isshin SS steps back, holds his sword for a few seconds while it glows, then suddenly does this huge spinning attack that leaves this massive shimmering white arc, how do i dodge it? the one where he slams the sword down and leaves the arc straight is easy to dodge, but the one where he does the spin is genuinely so hard. i jump, it hits me, i run, it sometimes hits me. i block, pretty sure it does damage

any tips?