Why did your teammate sit up? Also, I can't imagine executing a sprint with that sort of precision in Zwift, let alone racing as a team! The speed benefit of the "blob" in Zwift is huge compared to a pack or chase IRL, which needs to be at least somewhat organized.
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"Your beauty is an aeroplane;
so high, my heart cannot bear the strain." -A.C. Jobim, Triste