Race Comment Explainer

Original comment with matches highlighted:

chased leaders, t, taile quickly before 2 out, ore the la and before the last

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
pulled up	The jockey stopped the horse from continuing
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 jockey stopped the horse from continuing
The horse lost speed and dropped back through the field.