If you want to see the "dance" of the sidebands and carrier of B4 beam, here is a video of the B4 phase camera images around the moment where SR_Ty was moved horizontally during the lock of the 30/11.
SR_Ty was moved at 16:40:37 UTC (1min2sec in the video), it has hard to see if the beams moved with SR.
I would advise to watch the video in accelerate.