My assumption is that white blocks E1, then black moves the other rook up to the 2 line, which blocks the white King from moving down to the 2 line. No other piece can do anything about it, and the king is not close enough to attack if white takes the black rook on the 1 line and is blocked from the 2 line. From there it depends on black trapping the King in a mate. Unless there’s not something I’m seeing.
My assumption is that white blocks E1, then black moves the other rook up to the 2 line, which blocks the white King from moving down to the 2 line. No other piece can do anything about it, and the king is not close enough to attack if white takes the black rook on the 1 line and is blocked from the 2 line. From there it depends on black trapping the King in a mate. Unless there’s not something I’m seeing.