Conversation so far:
What type of injury did Seabiscuit have?
The diagnosis was a ruptured suspensory ligament in the front left leg.
When was this injury?
Seabiscuit was injured during a race.
Woolf, who was riding him, said that he felt the horse stumble.

Question: How was his return to racing?
Self-contained rewrite: How was Seabiscuit's return to racing?