CREATE TABLE table_63559 ("Rank" FLOAT, "Lane" FLOAT, "Athlete" TEXT, "Nationality" TEXT, "Time" FLOAT, "React" FLOAT)

What is Christian Malcolm s highest react when his time was below 20.58?
SELECT MAX("React") FROM table_63559 WHERE "Time" < '20.58' AND "Athlete" = 'christian malcolm'
SELECT MAX("React") FROM "table_63559" WHERE "Athlete" = 'christian malcolm' AND "Time" < '20.58'