Race Comment Explainer

Original comment with matches highlighted:

prominent, chased leaders, re 3 out and led off before 3 out,

Matched phrases & meanings

Phrase	Meaning
Chased leaders	Running directly behind the horses in front of the field.
tailed off	A definitive statement that the horse was finished and effectively out of the race
lost touch	The horse was struggling severely and the jockey was losing hope
Weakened	The horse lost speed and dropped back through the field.

Summary

Running directly behind the horses in front of the field.
A definitive statement that the horse was finished and effectively out of the race
The horse was struggling severely and the jockey was losing hope
The horse lost speed and dropped back through the field.