Time-Lapse: 2 Strong Updrafts Fully Turn into Cumulonimbus Clouds

A moderate cumulous cloud reaches the tropopause and expands into an anvil with a twin expanding upwards nearby.
Shortly before the video ends, the left updraft starts dying while the right stays strong.
Sorry it ends during a sustaining updraft, as my camera nearly died while I was away and making sure not to disturb it, causing the time-lapse to end itself.