Race Comment Explainer

Original comment with matches highlighted:

off the pace towards rear, pushed along , never involved,

Matched phrases & meanings

Phrase	Meaning
Pushed along	The jockey started to urge the horse (hand-riding, not necessarily using the whip).
Towards rear	Running near the back of the field.
tailed off	A definitive statement that the horse was finished and effectively out of the race
halfway	The horse was patiently ridden up to the middle point

Summary

The jockey started to urge the horse (hand-riding, not necessarily using the whip).
Running near the back of the field.
A definitive statement that the horse was finished and effectively out of the race
The horse was patiently ridden up to the middle point