If a traveller decides to return part way through his journey, can he still shorten his prayers on his way back?

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Check below answers in case you are looking for other related questions:
The traveller may shorten his prayers even if he is not encountering any difficulty
Traveller should make his prayers complete if he intends to stay more than 4 days

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Related Answers:
If a person is always travelling, can he avail himself of the concessions of travel?
Praying on a plane when one is unable to stand or face the qiblah
Should a traveler pray four rak’ahs with the congregation or pray two rak’ahs on his own?
The traveller may shorten his prayers even if he is not encountering any difficulty
Traveller should make his prayers complete if he intends to stay more than 4 days

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