Race Comment Explainer

Original comment with matches highlighted:

raced keenly in rear, headway out wide 5f out, weakened quickly and behind soon after, tailed off

Matched phrases & meanings

Phrase	Meaning
tailed off	A definitive statement that the horse was finished and effectively out of the race
Weakened	The horse lost speed and dropped back through the field.
Headway	The horse was moving up through the field.
Rear	Running near the back of the field.
Keen	The horse was fighting the jockey, wasting energy early.

Summary

A definitive statement that the horse was finished and effectively out of the race
The horse lost speed and dropped back through the field.
The horse was moving up through the field.
Running near the back of the field.
The horse was fighting the jockey, wasting energy early.