Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is Christian Malcolm´s highest react when his time was below 20.58?

### Inputs:
table_name: table, columns: ['Rank', 'Lane', 'Athlete', 'Nationality', 'Time', 'React']

### Response:
SELECT MAX React FROM table WHERE Time < 20.58 AND Athlete = christian malcolm