user: Question: What is Christian Malcolm´s highest react when his time was below 20.58?
Columns: ['Rank', 'Lane', 'Athlete', 'Nationality', 'Time', 'React']
Types: ['real', 'real', 'text', 'text', 'real', 'real']
Sample row: [1.0, 3.0, 'Brian Dzingai', 'Zimbabwe', 20.25, 0.172]
SQL:

assistant: SELECT MAX("React") FROM "Table" WHERE "Time" < 20.58 AND "Athlete" = 'Christian Malcolm';