'Mocking' is a plausible theme within Gemini 29. Mocking, ridicule, taunting, imitation in all their variations can be a way individuals experience the mockingbird symbol.
But there is also, and perhaps much stronger, theme of just not being bothered by ridicule or those derisive taunts made while mimicking another's voice or style. The key here is a strong self-motivation to just get back on the horse, so to speak.
Imagine an over-weight boy (as depicted in Sagittarius 29) getting out in the spring air to exercise. Others may make fun of these efforts, but the fat boy does not mind much. in fact, the drive comes from within to bounce back, get in the saddle again, and start over.
The mockingbird may also have a link to birds associated with prophecy or extra-sensory insight.It is as if there is an inner knowing that guides a new start, and that knowing is very personal, private and tends to go with an isolated sense of individuality... apart from all or most social pressures.