SELECT "Umpires" FROM table_18795 WHERE "Simpson Medal" = 'Paul Vines (S)'
Who were the umpires when Paul Vines (S) won the Simpson Medal?
CREATE TABLE table_18795 (
    "Season" real,
    "Premiers" text,
    "Runners Up" text,
    "Score" text,
    "Captain" text,
    "Coach" text,
    "Simpson Medal" text,
    "Venue" text,
    "Attendance" real,
    "Umpires" text
)