If you're really concerned about this, just slowly bring your feet into a shoulder width stance on the last move, raise your handsin front of you as you inhale and lower them as you exhale. A standard qigong ending movement.

Taiji is just qigong, and cannot harm you really, unless you do it extremely wrong maybe. The concern about this sort of thing has to do with shortened forms, not whether or not the entire cycle was completed. If you do a qigong for the liver and leave the other organs out, it doesn't really matter, as you are healing the liver.

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"I put forth my power and he was broken.
I withdrew my power and he was ground into fine dust."
-Aleister Crowley, The Vision and the Voice